I just popped back in a few years after finishing my first mame cabinet. This thread rings so true. It's the best reason to take your time and do a good job, and make it look professional.
I've found that others play my cab more than me. I run SNES titles on it, and the kids (3-4 years) love the Mickey Mouse ones. My parrents came to visit with my mom's boss and his wife (also friends of the family), and my dad and mom's boss stayed in the basement the whole time playing golden tee. We literally didn't see them for a minute, until it was time to leave, unless we went down there.
Friends my age (30s) like the old arcade titles.
I found that people heard I was doing it and were like, "meh"; assuming it would be a bodge job home peice of garbage. When they see it operating and all set up then they're floored.
Repair men see it when they come in to deliver furniture or fix the furnace and they say things like, "oh, neat, where'd you get that?". Then when you say "I built it" they suddenly get very suprised and go over to look at it and stare and mutter in suprised disbelief. The Air Conditioner installer told me to "f-off" (in a friendly way) in disbeleif.
I enjoy building it and setting it up more than playing it. If I play I'll play the old console games. I have a few favourite arcade games I'll play, but I find that most arcade games were designed to eat quarters and be too hard for any length of play. Something like tetris suits this well, but other don't hold up. I grew up a PC gamer.
I guess I should also say that I find it rewarding when someone says, "hey, this is really fun, we would use one of these". You made someone smile.