The amount of time it takes to farm the requisite 4,600 GIO per mount, for a profit of 44,000g per toon, per month, is not worth it when stacked against opportunity costs. It could be, feasibly, if there was enough volume of GIO being moved through the AH to sustain this and you were just buying it outright, but there is not. Hasn't been for years.
This leaves players chasing an endless loop of trying to get higher level Azerite gear — which can only reliably be gained through raids and isn’t available in Mythic+ — but only the pieces with exactly the right traits will actually be an upgrade. It’s even possible that some items that should be huge upgrades are nullified by the loss of a specific trait that makes one ability do more damage than the others.
Gathering (Mining, Herbing, Skinning, Fishing) – WoD almost totally killed gathering with the garrison but it made a big comeback for Legion. I don’t think BfA will be any different. Crafters always need materials and they will pay big bucks for it. While the crafting professions might have bigger profit margins, gathering has always seemed to produce a nice steady income. Materials always sell and usually sell fast. One thing I am watching for BfA is old materials. With the change to how you level professions, gone are the days of power leveling a new toons profs using only WoD mats. On one hand you won’t need to in order to do the BfA stuff. On the other hand if enough folks still like finishing off the prior xpac stuff, old material prices could go up and low level gathering might be more profitable similar to how Ghost Iron is now.
On my server, I can usually craft cards for around $2000/card and decks average for about 25k/deck (average selling price of all 4 decks) . The average profit per deck is around 9k gold, and I can process (on average) 9ish decks per hour. This means that the average gold generation rate of processing linen and herbs is about 80k gold per hour. That also leaves you with a massive pile of red pigments that you can AFK craft to scrolls for extra profit. (Crimson pigments gets generated at 75 pigment/min for "free" when milling for Viridescent, there is an extra 500ish gold per minute of profit when AFK-crafted to scrolls, that's not insignificant)
Because Blizzard’s formerly cash-only World of Warcraft services can now be purchased with in-game currency, many players are scrambling for the easiest ways to earn gold in World of Warcraft: Battle For Azeroth. While you’ve missed out on the initial wave of new herbs and ore flooding into the market, and while prices continue to plummet from over-saturation, there are still many other professions flying under the radar, and they can make you some serious gold.
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.