When were professions really good, in your opinion? I remember having fun with them in Cata, but that was because I was playing the gold-making minigame of grinding the ore -> gem -> j/c boe's -> d/e mats cycle, back when gemming/enchanting your gear seemed absolutely necessary and people not in accordance with Mr. Robot were kicked from groups. Oh yeah, and don't forget the primary stat boost for BoP gear that was profession-specific that made gathering professions anathema to a raiding toon.
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Another dungeon farm, this time in Uldum, Tol'Vir trash mobs drop loads of embersilk cloth. Stacks of this tend to sell for a tidy profit, though prices vary depending on the realm. A typical clear of the dungeon takes about 5 minutes, netting about 7.5k per hour in cloth, vendor trash, and various other drops like mats and BoEs. Pick up a Potion of Treasure Finding and farm to your heart's content! It's just as profitable on normal mode as heroic, too, making farming all the quicker and easier.
If you're just trying to sell one item once, TSM probably isn't the way to go. But you can set it up to do things like "find all BFA mining auctions selling for 75% of the market value", buy those, and then use a single button to "post all BFA mining auctions at 90% of the market value". This won't usually net you tens of thousands of gold, but it's a pretty reliable income stream for pretty low effort.
All of my gold came from everyone buying stuff at a really marked up price for instance BS 2h mace if it proced epic i was making at least 125k per one and i was making batchs of 10 to 15 it was like 25k for blue and 125k+ for epics at the time. And i was buying the ore for like 16g to 40g a pop so huge profit. Im still trying to figure out what im gunna do now to rebuild it will be a slow process now.