Wow. That is one overpowered dungeon. Er, maybe tone it down? But that would be a pretty cool idea... Unless you didn't want to do the dungeon and realistically are a friend of the owner. Seems like a cool idea though.
To make it fair, adding a harder floor costs X more money. Cheats also would cost extra. It would be based on your school. Also, you could select friends who don't need to face the dungeon.