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It'd be nice if it didn't always pick skins for champions I already own all the skins I like for.
I play these champions. I bought their skins. That doesn't mean I want their bad ones.
That, and they're less likely to get my money if it only gives me sales like this. Heck, there are some champions I don't play just because the base skin makes me sad.
They've also specifically stated that you can get skins for champions you don't own and will get them as a bundle. Perhaps this means it won't rely so heavily on who you play.