Quoted from copperpot:
When all of us collectors get old and move to nursing homes, do you think our kids will REALLY be that interested in keeping our $7-10k machines instead of selling them? That's where the 'bubble' bursts. Supply will rise significantly (so many of us fit into 1 of 2 specific demographics), Demand will wane (We will be too old to read Craigslist, ebay, etc), and prices will drop.
Until then, prices for A-list, good games will continue to rise. Why? Because we all make more money and have bigger houses and we are crazy people that can't just have 1 pin, we have to have them all...
I think my kids will keep a couple because it's now part of their childhood and our family history. But not all of them. And they'll need to find a pin technician because I've definitely handed them no such skills. But generally agree with the observations about demographic impacts on prices. Rising now as 30 somethings enter hobby -- potential big drop as current 50 somethings downsize to retirement living. Long live rock.