I feel like they're pretty popular on here. Search the cosmetics section for that big scopione splitter thread (the long-ass one that was dozens of pages); I think people were posting their pictures in that thread as they got them in, so it's possible not many people started their own threads for the splitters. It's also possible that the big thread got deleted for one reason or another, since I know that happened to another thread about angel eyes that was INCREDIBLY helpful, and it's kinda sucky it's not around any more. Just search "scopione splitters" in the cosmetics section.
EDIT - I just tried searching and can't find what I was thinking of. Either I was thinking of a SLEK thread with a lot of pages and I'm completely wrong, or the scopione thread was deleted. Still, I got a few individual thread hits when I searched "scopione spitters" so there ya go.