As it usually the case you are in a much better position to judge whether it was worth paying the price after you received the service rather than before.
Oh, absolutely. If you think you're buying "x" and what you actually get turns out to be "y" then you might have a different perception of value. But in this case it seems fairly clear cut - you pay "x" and you get to land your aeroplane. You have, in advance, all the information you need in order to decide whether you think it's worth it.