Best Vendor shuffle i did was buying up a ton of super cheap herbs (like stacks of Fireweed for 25g) at the end of Cata and exchanging them for enough ink to fill a couple guild banks so I didn't have to restock ink for about 3 years and saved a ton of gold
I had a few toons on a High-Pop server where I don't play much.I was pretty much pennyless there, server-wise.I got some cash over from my main's side via a rare cageable pet cross server sale, but the garrisons those toons had started (not really all maxxed out, too) proved to be a treasure trove. Each now has trading post and a modest set of 20 followers to run resource missions, as well as manned level 2 or 3 gardens to make the frostweed. This all goes to 2 or 3 toons that had space for alchemy hut, and all transmutagens made go to my alchemist. To get the volume of work lower, only 2 toons that are miners also have level 3 mines, which provide the ore for the trinkets.During the 2-odd months I took leisurely leveling the 6 toons there through invasions, I made nearly 100k gold solely from the WoD alchemy trinket shuffle, just spending a few minutes on each toon in their garrison every day. Was a good profit until I could get all those alts levelled, and until I started pushing their Order Halls. Once order hall is up to snuff, that's a better way to make gold, and available via the Legion app, too.For WoD, the Cards of Omens used to be a very decent, but work-intensive shuffle, since you had to flip hundreds of cards. I recently found some stash of mats, couldn't sell them off, so I ground that all and pushed into War Paints. I then flipped nearly 2000 cards, with only 3 procs of the epic ones. Netted me just pennies short of 10'000 gold and IMO way not worth the trouble. Your time is better spent WQ-leveling those followers for your Order Hall or clearing Argus questlines.As for boosts... I can boost, but CBA. I am usually late to that level of gear, so the price is down to where it's not that attractive to boost and there's a lot of competition. I only bought boost once, for Archimonde's curve, in WoD, where I was a mid-expac returnee and my guild was struggling with the boss. After that, I could easily get into pugs, and gear up to help guild's progress and eventual curve. Legion, we curved everything well ahead of deadline, so no need for boosts.