Quoted from Boatcat:
Boston Pinball, (for some reason, the modern day gospel), the value of replay games is in fact, still higher than most AAB counterparts despite the rarity. I always wondered why, since it would seem to fit the home environment better, and newbs, (having no nostalgic attachment), likely never played either.
I think your last sentence should be explored further. Since the vast majority of EMs are still going to those who grew up with them, it would make sense there would be greater demand for replay games, since most of us grew up with them. Nostalgia cannot be overlooked in the collector market. Most folks want to relive that experience again. I have restored lots of wedgeheads over the last 5 years. Unless a game is extra special (excellent original condition), like the Pin-Up I did last year, I still find the replay games sell much easier than AAB games. It may be local market conditions will vary, but that's been my experience.