You will need to cover very large areas in order to get a few chests as they are quite rare. Vanilla, TBC and WotLK zones work best. The way I like to do it is to park one Rogue class trial in Outland and one in Northrend, then fly over the whole continent and look for chests. One whole run might only yield 3-10 chests but you will still make a bunch of gold as you are almost guaranteed rares in chests in these zones.
YouTuber Oldbess recently uploaded a video about this cool method.  Generally completing the scenario "Deaths of Chromie" will allow you to pick up the item "Time-Lost Wallet" in excess.  You can get it from just killing the mobs or actually completing the scenario in full.  By then end you will have dozens of time lost wallets.  Each wallet awards 50g AND a rare chance at getting the ]bronze proto-whelp[/U] pet.  In the video, this spot was VERY hard for to pull off as it requires a high item level.  With an 809 item level I struggled all throughout the scenario and could not make this spot profitable for the time invested.  The good news is, if you can get it done, the gold you make will be entirely liquidated – the rewards are 50g raw for each wallet turn in.  I suggest you watch it on Oldbess's channel for full details.
Yes!  I joined twitch in 2013 with the gamer name of FuriousPaul and I streamed speedruns of the classic Castlevania games full time from 2013 - 2017. Lately my streams have died down quite a bit due to working on Classic WoW leveling guides every day.  My channel is now twitch.tv/Joana.  I will be doing a speedrun for Classic WoW once it launches, so be sure to follow my Twitch channel.
It seems Classic really is bringing old friends together, as Blizzard have gathered up the original development team for Vanilla and had them chat about the experience of making the game while playing Classic. We have legends in the WoW community talk about their origins so to speak, what jobs they started out as, including the first 2 quest designers in Pat Nagle and Jeff Kaplan. We also have the return of the previous game director Tom Chilton aka Kalgan, as well as Alex Afrasiabi and Aaron Keller. Kaplan's goal of Onyxia by the end of their play session was not achieved, however, but Metzen does get a mention and a quote! 

Some dungeons are also much better than other. Some take a long time to finish and some are quick. Some have few quests and others have many. The ideal dungeons have a lot of quests and are quick to finish. If you are sent to a long dungeon that you have already completed, you can leave but you won’t be able to enter a new dungeon in 30 minutes. Dungeons like the Stockade are super quick, so it will still be good XP if you are sent here more than once.
So gibblewilt is a special NPC. He is the only NPC that drops the Foremens Vest chestpiece.  Generaly this transmog is a bra-less vest – making it VERY popular in the transmog community (I play on moonguard, and are highly invested in the transmog community, so I know).  Anyway, even though the drop chance is hell on high water – snagging one can yield you profits of 50,000g or more. Whats better is usually noone can be found farming him, so you can camp an alliance character nearby, and kill him ever-so-often.  Hes located just outside gnomergan.
Dugi’s leveling guide is the leveling addon I’ve always used to level as fast as possible. It will show you where to go and what to do in-game, speeding up the leveling process. This is optional though, as the game already does a pretty good job at showing you where to go at all times. The addon does, however, come with a couple of other nice features and perks.
Another potion of treasure finding farm that was made extremely popular by the YouTuber Oldbess.  In this spot, you are simply to patrol the entire southen river basin in Twilight Highlands, just around the Verrall Delta area.  The goal of this farm is to kill water elementals for their volatile water, which trends around 50g per drop.  Combine this with the cloth and the treasure chests, and you have a cool  nifty farming spot – thats rarely populated these days.
The fastest way to make gold in WoW is going to depend on how you play the game. The most sustainable model of earning is the one that fits into your WoW BfA playstyle. My eight methods of farming WoW gold in Battle for Azeroth shown here will help you augment the WoW life that you already have to generate more gold income. No one gold making solution is right for everybody, so if a gold making method isn't working out for you then try something new! All WoW gold numbers shown in this video are approximations that will vary based on your server and the current state of the WoW gold economy. Because not much new gold is being created in WoW in BfA compared to past expansions, the value of gold could change a lot this expansion.
I certainly didn’t think so as I used my Paladin for countless hours of gold-making (Paladins are one of the slowest classes in the game). But then I decided to try to make a Fury Warrior with 170% base movement speed. Boy did that make a difference, I run dungeons several times faster than the Paladin, hence making 3 or 4 times more gold per hour.
Okay, this farm is by far my favorite old world farm.  Generally because discovering this spot is like finding a hidden gem that the developers do not want you knowing about.  The thing is, everyone talks about farming zul farrack by pulling the entire instance... Nope, the real gold is made by flying over zul farrack...  If you fly over zul farrack until you reach the large steps that begins the usual third boss scenario, you will find that there are literally 50 trolls just hanging on the steps and another 25 just sitting at the foot of the steps.  It's an amazing scene, as all these trolls have ACTIVE level 40-45 loot tables.  Each and every one of them can drop cloth and mogs from the mid level era of items.  Whats more is they don't take too long to respawn.  ALSO they are not affected by the 7.3 transmog nerf because they ARE NOT in an instanced zone.  Making this spot the BEST transmog spot in the game IMO.  Check it out in the video, it's really awesome.
This farm almost did not make this list. Even though I have had only a little luck with it, it seems to be gathering some popularity in the gold farming community.  Although I feel with the recent changes in 7.3,  this farm is very close to dying out.  Generally what you want to to do is pull every mob you can as you venture to the last boss in the instance.  The only saving grace of this farm (if you can call it that) is that some mobs are GUARANTEED to drop greens.  Guaranteed.  Whether or not they drop profitable greens is a different question, however it's a must-mention quirk you get from running this instance.  It also allows you to get your hands on some rare low level blues.
It seems Classic really is bringing old friends together, as Blizzard have gathered up the original development team for Vanilla and had them chat about the experience of making the game while playing Classic. We have legends in the WoW community talk about their origins so to speak, what jobs they started out as, including the first 2 quest designers in Pat Nagle and Jeff Kaplan. We also have the return of the previous game director Tom Chilton aka Kalgan, as well as Alex Afrasiabi and Aaron Keller. Kaplan's goal of Onyxia by the end of their play session was not achieved, however, but Metzen does get a mention and a quote! 
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