Man, you really should play the game if you're trying to be mad about the additional content. It's really good and it's ten bucks on sale right now. Forty to get all the extra content. Well worth it.
The stamps are mostly premium edition filler. There are hundreds in the base game and nobody is particularly mad at the three jpegs they try to sell for two bucks as a way to pretend they added two bucks of value to your premium bundle.
The music pack is pretty solid, though. Lots of licensed anime music. Can't argue with blasting out Solid State Scouter when playing with Bardock. Just... remember to disable it if you're going to stream the game, you will get dinged for copyright infringement on Youtube. You want to get mad about something? How about selling people music as part of a game and then accusing them of infringement for streaming the game they paid for? How silly is that?