Quoted from HFK:Sounds more like you are dealing with every Harry Dick named Tom. There are some great deals on EMs down here, fully working games in really nice shape $500 and under. Unless it is a rare game an EM project is $100 - $200 if you can even find a buyer.
To me, unless it is collectible, $100 is about my limit. Here's why:
A friend asked me to work on her Bally Bow and Arrow. I have a Gottlieb Jungle. Both have sold (not Listed, sold...click on "completed listings") on ebay for $350 to $400. If I put $100 in a machine, another $50 to $100 in parts (assuming nothing major is damaged/missing), 15 to 20 hours work, do EXTENSIVE testing , and I walk away with $400, I'm ok with that.
I'm not in it to make a living (tho I wish I was), but I don't want to lose money on the deal either.