Also Pac-Man, Galaga, and Ms. Pac-Man machines are a special case.
First off they all had huge (around 100,000 each) production runs Secondly they are so popular that there are still tens of thousands of each title floating around.
In fact, there are SO MANY Ms. Pac-Man machines out there that I predict they will not be worth very much ten years from now. The arcade collecting scene is already dying down slightly, and will continue to decline forever. No one wants two Ms. Pac-Man machines. Just give it another 10 years and there will be more Ms. Pac-Man machines than there are collectors, and then they will be worthless.
As far as black and white games go. From what I have seen, no one seems to care. They may complain about it, but then they don't save them either, and don't keep them in their gameroom. I sold the non-working PCB and working monitor out of my Amazing Maze upright for simple reasons of economics. No one wanted to buy it non-working. I couldn't handle the boardset repair myself, and the shop that fixes the Midway 8080 boardsets charges like $115 plus shipping each way to do so.
So, it would have taken me about a $150 investment to get the game working, and the end result would have been a game that isn't really fun, and that no one was interested in, and that would be difficult to sell for the $150 I had into it.
So, I sold the monitor, power supply and boardset for $100 to someone else so that they could get a different (much more fun) Midway 8080 game going, and just did a cosmetic cabinet restoration and went the Mame route.
The end result there? 1 Sea Wolf machine that was previously not working is now working (from my parts). One (perhaps the last?) Amazing Maze machine that was non-fuctional is now functional, just with a slightly different function. It can still play the same game, and the new electronics (and other capabilities) ensure that it will be around for years to come.