I want to emphasize what Hung said. We are not necessarily trying to talk you out of purchasing an airplane, but the costs are bit more complicated than buying a car.
The other factor is the completion rate. Even in my short flying career (about seven years) I know several folks who quit flying either during their training or shortly after getting their license.
I had already scared myself a couple times, and knew I was going to keep flying, before I purchased an airplane.
Reg