So, looking at Wowhead's updated profession guides, there's one new thing that's a big chokepoint for profits, and a real slap in the face to folks with certain dual-crafting professions.
All JC, LW, BS, and Tailoring epic items are limited to 3-total equipped. (Eng is not included, but it's gear is lower ilvl, so will be outgrown sooner). This includes crafted weapons (also includes Inscription staffs but not the offhand).
So this obviously puts a huge dent in potential profits from limit on sales of the items and their upgrades.
But it's probably a bigger slap to folks who have paired JC with BS, LW, or Tailoring, or to a less extent scribes that are paired with those. I'm certainly glad my DK JC/BS is not my main, if he were, I'd probably be dropping JC for a non-impacted crafting profession.
I can see why they put a limit in place, but the limit is too steep. Gonna be a hit on our mains, and in our pockets.