I don't think its just the eastern market that's in love with iron man.
I also don't think the majority of the suits are so unique. About half are just repaints. Outside of a few they are all pretty much just different colors of the same suits. With human figures usually the only thing that's the same (outside of a few exceptions like thor sleeved ect) is the head. And even that is often different in some way. I don't think DOFP wolverine is closer to origins or "the" wolverine then Midas is to mk7 or mk3 to bd mk3 to DC mk3, or mk42 to mk43..same with AoU cap and his early ww2 uni (for the life of me I can't recall the name of that figure right now)
It's indivudual taste and for some trends.