The stirrup lasts for 2 hours. Two hours of farming my route earns me between 50-80k depending on Anchor Weed spawning on Moon Guard. The materials sell almost instantly if you price reasonably. I don't farm every day and I'm still sitting on almost a million gold. BfA is the expansion where I no longer pay Blizzard. They now pay me to play with how little gold tokens cost right now.
The Escalation patch has introduced several new scenarios with respective heroic modes that provide shiny new loot. It is still too early to predict which of these will demand the highest prices at the auction house or AH, since it can take weeks for players to work through the content and determine the value of the new drops compared to the existing items. Many expect the rarest and most prized drops to start commanding handsome prices starting June, so just keep your eyes peeled for popular WTB requests in general chat and high-selling items at the AH.

 Zandalari troll (8.1.5) - "The Zandalari are a proud people whose origins date back to the early days of Azeroth's history. Their fierce warriors ride dinosaurs into battle, and they possess one of the most formidable naval fleets in the known world. But enemy attacks on their borders—as well as unrest within the king's council—have threatened the kingdom's foundations. By returning stability to Zandalar, the heroes of the Horde can gain a powerful new ally.."

World of Warcraft: Battle for Azeroth is the seventh expansion pack for the massively multiplayer online role-playing game (MMORPG) World of Warcraft, following Legion. It was announced at BlizzCon on November 3, 2017. In contrast to previous expansions, which went live at midnight in each time zone, Battle for Azeroth had a simultaneous release for all regions, corresponding to midnight Central European Summer Time on August 14, 2018.[1][2][3]
Rank 3 is terrible design, if they we're most open about how they drop etc. I, as a avid LW collector (Yes I have all recipes in-game but IIRC 1 from vanilla, few from TBC that was removed due to stupid design), and I still dont have all rank3 from LW despite plenty of runs through the 5 mans for em...Ill just wait for next exp or w/e and stealth runs.

With the most in-demand decks going for up to 20,000 Gold each, Basil believes that Darkmoon cards (12 of which when combined form a full deck) can earn scribes the highest possible WoW Gold. But he said that it takes intricate planning and logistics to really ramp up the Gold income from Darkmoon cards due to the constraints surrounding its crafting cooldown.
Yes, that is easy, but it's not quick. Further down in my comments to OP I detailed the GIO farm, and reasonable yield expectations. I looked up a few guides/videos before commenting and most of them estimate a yield beween 800-1,000 GIO/hour. That lines up with my past experience with it as well. That'd be, taking the high yield end, 4.2 hours to farm the GIO for one toon's monthly needs.

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.