As for the market, it seems to favor new and LE machines in particular and certain highly restored machines (eg. Funhouse). Not so with highly restored EMs or machines made in high volume that are getting older and not in pristine condition. I would think it is hard to know what will happen in the future.

More on point, you asked if you have a game bolted to the floor, and if so, why? Aquarius is because it was the one I played as a kid and the machine that was associated with my interest in pinball. I have a HUO and I paid way more than market value on purpose 15 years ago form a collector not motivated to sell so I could have that example. I think personal connections to the machines for reasons like that are why people will not want to sell, even for profit.

I think a MAJOR issue related to someone's willingness to rotate machines is the size of their collection and space limitations. If you have room for only 2-5 machines to have setup and play, easy for those machines to all be keepers. However, if you live in the midwest and have a basement and a collection of 10-20+ games with no space issues, then it makes it easier to rotate and not be attached to all of your machines.

I never thought of it that way. Interesting. For me, 2 have connections to childhood. My Funhouse is getting some upgrades and I just do not think I would want to exchange it for any other machine. My Flip a Card could go, but it is fun to play, and beautifully restored, and I never get tired of it and I like the look. Interesting that when people see it in the background of pictures, they send me messages asking to buy it.

I am making changes though. First time in 15 years. Sold KOD and Kings and Queens and gifting my restored Buckaroo and will get EBD TZ, and perhaps BOP. Still, for me, these decisions are not about the market value changes.