I was at the Arcade auction in Kingsport Tn last month, and they were selling those machine for AT LEAST $500. The worst crappy conversion you can imagine too. I saw one that had spray painted black marquee on it and it sold for that. Burned in screen and all. The bigger money on the crappy ones were ones in Pac/Ms Pac Cabs. They pulled about $700 +
Anybody that had the skill to put one in a machine, did, it looked like to me.
The BIG money went to the brand new machines with trackballs. Somebody had a bunch of what looked like MsPac/Galaga cabs brand new with shinny new trackballs. The side art and CPO's were like dedicated machines. The color scheme was greenish over black. Lots of all the characters on the side, like Pac Man, space invader graphics, etc.
They went for over $1300-$1800. I think they had LCD monitors. And they came with a warranty, too. So that helped I'm sure.
But they were brand spanking new. I thought they were very nice. I wouldn't buy one, as I'm cheap as hell and I could probably make 3 or 4 from the junk I have.
Used to be that they avoided all those games because Namco actually came in and pulled some out in '06 or '07 as I recall.