Some people stick with a hobby. Some people don't. Some people overdo and burn out. Some people enjoy part of pinball be it playing, collecting, fixing, shows, the people, etc. and lose sight of what they once liked about it. Some find other interests that bring them more enjoyment.
And some finally met beelzeboob and called it a day. They'd reached the pinnacle of the hobby and it's all downhill from there.
LTG : )