Donkey kong
We did the straw trick on donkey kong. You just flattened it and slid it in by the hinge and moved it around till it gave you credits. I remember having 90+ credits on one by a grocery store once.
It didn't work on donkey kong jr
I had a cocktail super cobra. I suggest you go over there, play it for about an hour, by then you will have finished all ten levels, and you won't want to own it anymore.
I went to Michigan State University from 89-92 and a guy on my floor brought a centipede and a fooseball table, they both barely fit in a tiny room across from our study lounge(to which we all had a key). Centipede didnt see much play, but we all played the hell out of that fooseball table.
I didnt see where you are selling the slot cars, and replacement parts for them. if you arnt selling the cars and such, you may be missing out on another source of revenue.
I have a Gorf game(love it) and played alot of Tron back in the day, and remember getting bored with Tron after the first level. It just got too difficult to beat, maybe there are settings that can be changed, but tron just sucked after a while.
I put it in the same category as Crystal castles...
Yeah i bought a crystal castles a long time ago(lame game, but a cool cab) it all worked out in the end, i traded it for a punch out even up, and later after growing tired of it, i sold it for a hundred more than i bought crystal castles for.
if the game was $1500
you would need 200 plays a day for 30 days at a quarter a game, to get your money back.
if a game lasted on avg 3 min thats 10hours a day uninterupted game play.