I'd like to add my personal experience as of a week ago in regards to illusions: I bought all of them for 10 silver being the highest bidder. They sell for 2-4k each usually, but it's a very slow market with little interest. They might be a nice addition to your portfolio if you can get the mats with little effort, otherwise it's not enough to warrant investing in it. At least on my server.
It is really, really a stark change of pace from WoD and Legion where just questing and killing things would result in at least a small but decent profit from a day's activities, typically of at least 1k and often 2k. But now to get that sort of return, I have to really focus on gold WQ's, not spend any money on anything that I don't absolutely have to, and do 45 minutes of Legion content.
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Lightforged draenei - "For untold millennia, the Army of the Light waged war against the Burning Legion throughout the Twisting Nether. The draenei most committed to their long crusade would undergo a ritual to become Lightforged, infusing their bodies with the very essence of the Holy Light. After finally achieving victory on Argus, the Lightforged Draenei have undertaken a new mission: protecting Azeroth from rising threats and helping the Alliance push back against Horde aggression."
Came back from a good break again but really enjoying BFA so far. I've really been interested this time in getting my transmog sets, pets, mounts pretty much all collections / achievs. I've never been interested in this stuff since wow vanilla so it's like a whole new game to me, which is pretty cool! My current 5 man instance party is Resto Shaman, Resto Druid and 3 Hunters which works out really well. Double healer + 3 dps that can serve as tanks seems to cheese lots of encounters.
2. Island Expeditions. What?! you may ask, but it is simple. The transmog that drops, now rather frequently, from the expeditions sells well and for high amounts. Despite its somewhat common drop rate the fact that the loot table is so large means that people seeking certain transmog will be more likely to buy it than farm it. The parroted meme on r/wow that it is unrewarding only makes it better for someone like me. In the past two days from doing Island Expeditions on the side (about 20 total) I got 6 transmog items of TSM values between 15k and 150k. I sold 3 so far totaling 140k (Plundered Squid Caster: 50k because I wanted to be rid of it, Stinkrot Smasher: 69k, Razorfin Breastplate: 28k). Pet drops are a different story and while you can sell them, the fact that they need to be looted for the achievement means that the potential buyer pool is smaller.
Mythic+ rewards will also go up by 30 item levels; however, during the first week of Season 2, rewards from end-of-run chests will be capped at Mythic 6 quality (item level 385), and the chest you open next week will contain Season 1 rewards if you do a Mythic+ run this week. (So, for example, if you do a Mythic 10 during the final week of Season 1, you’ll get a Season 1 item level 380 piece and 60 Residuum from your first Season 2 chest.)