Despite the above, some flying schools/clubs seem to have a never ending supply of new students dripping in cash. To the extent of, in my experience, one school refusing to take slot bookings from one student as he had recently cancelled a couple of trips at short notice (but had given notice I hasten to add). Perhaps the closer to London the easier it gets.....and thus you can afford to cherry pick your customers...
A very sensible decision. It's not about "cherry picking" it's about protecting your business. Someone who constantly cancels at last minute isn't worth keeping about. You lose a slot, the FI loses pay and the other students lose availability.
My policy has always been, if it's less than 24hrs notice or a dire emergency, then frankly the student should pay a fine. Try cancelling at a hairdressers at the last minute and see if they charge you...Why should a flying school be any different.