As well as being an obvious attempt to bait impulse buyers, new collectors and people who need stocking stuffers, I honestly think that they're just flawed ponies that they didn't want to use for regular sets. The only bagged pony I have is Lily Blossom, and as much as I love her, she has a paint/factory error mark on her forehead and her body. Maybe they're selling them for such a low price because their quality isn't as high?