I wondered about a wheelie school, then decided to enlist in a "How to overtake over solid white lines" school and a "How to speed through villages" school.
Why waste money? Can't use the skills you gain anywhere except private roads. Not trying to be a killjoy, one of my colleagues asked me if I wanted to go to a wheelie school with him and he got the same reply. Can't see any point in it myself, just my opinion.