OK, does someone want to tell me why Vinyl Scratch, a pony who has had no canon speaking lines whatsoever, is Tier 2 in CC, while Prince Blueblood is tier 3?
Vinyl's tier placement is dictated by her presence in merchandising and her perceived desirability among fans. Popularity isn't the deciding factor for that kind of thing, but when it's undeniable as with her and Derpy we do take it into account.