DMF Cards the first ~72 hours of the expansion. Every deck was selling for 500k-750k after 24 hours, so I spent all the time I had and just shuffled bracers info expulsum. Constantly spammed trade that I was buying herbs at just about every price, and just went to town. Once the weekend hit (Friday), I sold my last few decks (made 44 total in those 3 days I think), and listed all my leftover cards on the AH at a decent cut.
The hexweave bags are still a safe bet unless the new 32 crafting cost is like 10% of them. The one thing I'm more concerned about is the professions squish. This will make the old world items that we've been selling (TBC Dust still sells by 200 stacks easily) only required for Transmog and not leveling. This was a better option for a lot of professions (especially enchanting). Expecting their near-death with the next expansion. :(
Patch 5.3, like all new updates, is attracting a throng of returning players, many of which will be undergeared and willing to spend Gold to catch up with the rest. While the profits might not be as lucrative as with the new items, there may be less competition here. The key here is scanning the market for in-demand leveling gear and producing the right amount to avoid getting stuck with an unsellable stack of outdated items.
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Battle for Azeroth, despite the endless grind, has been an exciting expansion this far. However, raids and additional content are what makes the game great. Blizzard has made the entry level into the new expansion welcoming for new players and some die-hard critics have shared their concerns with the current direction Blizzard are going with making the gaming “easier.”
I think that's server dependant. I make a lot of Golems, but the price on my server is high enough that you could buy all the living steel and still make about 20K (almost 200kg on AH). Its just that you proc all the way up the chain. You proc 20% of your trillium, and then 20% of your living steel. SoH and Ghost Iron are such low effort farms, too. 20% of 180 Trillium Bars at 500g is 18k more profit, 20% of 150 Living Steel at 3500g is another 105kg. That's an extra 25k profit per Golem. If they stop selling stockpile them for the next expansion, they always boom with the price of herbs. And a consistent 20% proc rate is the opposite of RNG, its extra free stuff as a benefit to completing an extra quest (not to mention for new alchemists the investment of leveling Vanilla Alchemy). You're looking for some get rich quick scheme, where the real way to build wealth is patience and volume. No market is going to be viable because you want it to be. Only because you make it viable.