If you buy a £50,000 car the dealer is going to make something like £7,500 out of you + servicing and repeat business.
A large FTO might make £1,000 out of you and then you're off over the horizon.
As a PPL instructor I saw the books at my little school. They made £300 out of each student. Over three weeks.
The fact that the student is paying big money but the school only makes small money is the reason why there is so much antagonism between school and student. Students expectations are high. Schools margins are low.
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