It looks like a "fair" deal to me.
The questions I would ask you are:
1) Would you like to have an Asteroids machine enough to pay that for it?
2) If you knew that you would take a loss on it when you went to resell it, would that make a difference?
I've never viewed things of this nature (guns, cars, arcade cabinets) as "investments".
You buy them...you use them...you get enjoyment out of them...and then, if at some point the enjoyment factor is not there anymore, you sell them for whatever you can get out of them at that time, and let someone ELSE enjoy them.
There is a value to me on actually USING something.
I've got one hunting partner that just about went nuts one time because he got a scratch on the "collector's edition" Weatherby he was hunting with.
I didn't understand why he would own a gun that he would have to worry about scratching.
In contrast to this, I have another hunting partner that would likely be shot on sight by some "collectors" because he had a gunsmith put a scope on a low serial number Winchester Model 70 (which is a collector's item now).
His reasoning was that "he bought the gun when he was young" (21 and straight out of the Marines), was "NEVER going to sell it" and "had hunted with the thing all his life".
Any "investment" he had in it, that was ruined by his "hack" job, was his kid's loss once they inherit it.
He is going to USE it until he DIES.
THAT is the attitude I would take, if I were you, in this decision.