Exactly 72% of pinball owners are not on Pinside. Of those owners (of that 72%), 22% of them only bought games to finish off the proverbial "Man Cave". 17% of those "Man Cave" games no longer run (simple things like battery leakage to the point that the machine will not boot). All these numbers were compiled by the World Pinball Consortium (WPC). They break it down a bit farther by games played on the machines which is a fascinating read. They even get into if the game was actually bought from the children, or the grand children (hint, grand kids by an overwhelming margin) and they break down income vs disposable income.