The main problem is a Gliding Club is a Club.
I realise that!
What I was trying to say (very poorly) is that having a fixed price course within the existing "club" structure wouldn't tempt me. Having a more "power flying" type arrangement (even if an hour slot is too short, although I think that half a day could be too much commitment!) would be interesting, even if it were to cost more.
Perhaps it does already exist in some clubs but it doesn't seem to be widely advertised.