The 13 pins in my game room I plan to keep until I die. I might be tempted if someone offered me $20K for my BBB, but then I'd have to plan on never having another even if PPS remakes it some day.
Baywatch and Barb Wire and X-Files don't fit in the room, but they're still fun to play and it's not worth selling any of them for the relatively cheap prices they usually go for.
Maybe it is different for people who buy a pin and then play it to decide if they like it or not. My friends and I used to drive all over the place to play a lot of games in order to decide which ones we would like to permanently own. That's how I ended up with the pins in my game room. I'll admit that I wanted to like Mustang because of the theme (my wife and I own 4 Mustang cars), but I still played several games on a couple different Mustang pros before I decided the gameplay was good enough for me to purchase a premium. I've owned two 'vettes in the past ('62 convertible + '64 coupe) but never wanted to own a Bally Corvette pin because I felt the gameplay was only okay.