Not having more boys costumes is just leaving money on the table. They've got Marvel, Star Wars, and Toy Story costumes locked down, but Flynn Rider, Kristoff, Aladdin, various princes, and even some villains would sell big.
I always liked seeing the kids who did this running around in the park. Kind of fun. Sorry to see it go.
We took my son to do it before a Halloween party when he was 4. He just didn't want anything on his face though. So after about 15 minutes of working with him and him refusing, we decided that just wasn't something he was going to do. They CM working there was great, and didn't charge us, which was nice. We did tip him though.