oh, and here is one last thought, from another thread (thanks to madjock).
Why not allow customers to learn, and give them the option of buying in to a syndicate plane, and then only paying for lessons (wet per hour rate is their responsibility). Several clubs are now doing it, and it gives a real sense of ownership, and can often make the learning process cheaper.
It may also expand your possible list of planes. I seem to recall something about it being okay to learn in certain non CofA planes as long as you part own it (but I cant remember any of the details!)