I don't know if you can call it demand destruction in this scenario. We are in a really weird time in our lives. Inflation is the worst it has ever been since the late 70's/early 80's. Home interest rates are now 7% plus on median homes of $300K. A loaf of bread is $3 to $4 dollars. That new soccer mom mini-van will now cost you $50K . I don't know what to call it, maybe the "fringe disposable incomes"? But they are now gone. There is always going to be a certain percentage of disposable incomes, but just how much are they going to continue to buy? The collection cannot get larger if the space to have such collection stays the same. If you have to sell a game to buy a game, you are taking another potential NIB buyer out of the market with the game you sell. Honestly, I believe the market will cap itself and companies like Stern & JJP will have to figure it out. I do believe STERN is on a path of uh oh, and it could kill them.
This hobby is not your 20's something lifestylers buying these machines for their collection, this is a 40's and up homeowners collectible. There is a bubble, but it will not be the price bubble everyone likes to talk about. It will be the next "whatever" that knocks pinball off of it's pedestal again.