Thats the things, i'm predominantly a variaiton collector but mainly go for noticable variations, I like the fact that people look out for minor sculpt differences/COOs and paint alterations, although I found bootleg collecting to be a natural progression, what happens when you have all the major variations and there is only a couple of minor ones left on the list? Nothing to collect.
Nothing excites me more than the prospect of picking up a mint Uzay or finding a really nice Polish boot with nice colours to add to the collection!