The store sells upon stereotypes of a certain genre or scene and builds a fashion base around it.
They claim to be "Everything About the Music" yet sell mainly Nintendo retro and otaku based shirts. While they do have a large array of band shirts, atleast 10 of them are by the same band, whichever is most marketable at the time.
Also there you can find a good deal of "anarchy" items for anywhere from $10-25.
In 2004 alone, Hot Topic's revenue was $656,470,000.
If you really want to be rebellious and original, pick up a needle and thread and hit up a thrift store.