They are not making TZ any more or WH2O. These are not comic books!!
There are many more collectors than there are pinball machines.
Once the best ones get scooped up there will only be 2nd rate pins left.

Remember, Price is all about supply and demand.

As the supply gets smaller the price gets higher.

And they are not making MB anymore.

There is no bubble.

the reason the Comic book and Baseball card market crashed it because it is to easy to fake those. Advances in the printing trades made it easy to reproduce. Who is going to buy an original when they can buy a copy for half the price? Who's going to buy at all if they don't know if it's real?

There are no counterfiet pinball machines. The price will only be limited by the cost it takes to reproduce them. And JJ is setting the market at 7500. That's why MM has come down in price. It was too high.

And that a house is not an investment. Of course a house is an investment, It may not be a good investment right now but it's still an investment....I built many many homes in the 90's and I did very very well. There is plenty of money to be made in the housing market. I was fortunate enough to get out of that biz before it crashed.