Personally I'd give it a thumbs down. Perhaps I've been spoiled with some of my finds locally (only 5 to date but were VERY good deals all things considered).
At least you got a pacman cab.. that has more value than most.
The pacman board is the most highly diagnosed board out there.. Search google and you will find at least 2 VERY good resource sites (one with 114+ pictures of problems to match to a solution). However it might involve desoldering/resoldering replacement chips. Or it could be a fried address board or sync board too.
Sounds like you at least could recover $50 on the board for someone who wanted to risk it.... dunno though. I personally wouldn't pay that for it in the condition you describe, but I know ebayers will.
I wouldn't have paid over $125 or so for the Pac (if monitor worked)... $75 if monitor dead, and $150 for the robocop.... but that's me and I'm cheap

[Not saying I would have bought either, just giving you a price I'd feel reasonable in assessing them--IF I had wanted them]
Unfortunately you hozed yourself breaking the other monitor.. Sorry to hear that.