Numbers reported are really a bad metric to evaluate how widespread or how small an issue is. Pinside is a small portion of the overall pinball community. Not everything will make its way here. Things can look bigger or much smaller than they really are. Reports help explain what an issue is, but they don't give a good representation of how common a problem might be.
Right during the height of the ghosting playfield problems when you couldn't look at Pinside without seeing 10 threads on the issue, I pointed out ghosting inserts to someone on their Ghostbusters. They didn't even know what I was talking about, so I explained and showed them. I have to image that many people like him let that issue go unreported and never addressed.