Why I fly
Lister, You've hit the nail on the head. There must be loads of us old guys who just want to fly because we can. I normally land at the airfield I took off from, even if only because that's where my car is, and I need it to get back home.
There's loads of fun in flying, even under the "restrictions" of an NPPL. I can see that the youngsters who want to carve out a career in aviation may want to get more out of a couple of hours in the sky, but I am happy just to visit friends or fly over my house and the house of my passengers for the day.
I suspect that the people who give up after a few years should probably not have taken it up in the first place, but they were not to know that until they had experienced it.