This is in interesting thread. As a person in my 30s who certainly paid too much for a Cirqus Voltaire, I have a few thoughts.
Like the g0nz0 I was never huge into pinball. Arcades were everything to me. However, as I've gotten older, pinball has become more and more of a major interest of mine. Will that persist? Who knows. But it is building into a nice hobby on top of the arcades I own.
I think the comment about EM prices being low because the 90s games are generationally appropriate makes sense. However, I find myself getting more interested in EMs now that I own this 90s machine. Furthermore, I played CV for the first time only three months ago.
As for the price, I did research, and I knew it was too high, but I didn't want to pass up what appeared to be a good thing. The simple fact that these games aren't being built anymore causes some level of panic when you feel like "that is the one." As a result of this "scarcity" I was willing to pay a little more to ensure that I could get one.
Lastly I watch my four year old play this game, and she absolutely loves it. I think that the cyclical nature of products and trends directly correlates to the parents raising the next generation of kids. There is a good chance my son and daughter may actually like the feeling of an old stand up arcade or pinball machine. It could potentially be nostalgic for a whole new generation.
Obviously you can't know the future, but this is a fascinating thing to watch. Hopefully I didn't annoy anyone with my opinions 
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