I'm wondering what would cost more. The running costs of an R22 or replacing one of those little jiggers each time a student destroys one.
SAS you should stop knocking the R22 so much mate. If you had operational exposure to them and realised what they are capable of and how reliable they are when they are looked after properly than you might realise that it is not the aircraft, it is the type of pilot that it attracts. If the R22 wasn't around they would all be bending the next biggest thing.