For some reason when a doctor or a lawyer graduates he/ she is not driven to the point of despair and does not have to beg for a first job wherever it is.
Unfortunately for lawyers, this is certainly not the case. In fact many pay BPP or others a fortune and equally get nowhere without a sponsorship of a law firm.
Flying is not unique in this respect - there is a market, and it involves a large dergee of luck, skill and stamina to win.