I think it's an excellent question. A huge proportion of people who get their PPL give up within a year or two - something like 60%. If it's such a no-brainer, why do they do all the hard work and then throw in the towel?
Certainly if I was taking up something which costs 5 grand to get a licence and has such a drop out rate I'd want to know what people really get out of it before I spend the money.