You would need to do a good deal of work to get your money back on that crappy warehouse lot buying it at 8k.
Ok. Lets assume the good Ms. Pac is worth $800. And that the other 11 Ms. Pac cabs can be sold for an average of $200 each (judging from the ones in the picture you probably could). There is $3000 right there.
I count 21 games classified as working. Lets just say they are worth an average of $200 each. That makes $4200 more for $7200 total.
That leaves 123 untested/incomplete games. You would need to get an AVERAGE of like $8 each out of those to break even.
With some smart selling the buyer could sell off all the workers and Ms. Pac cabinets and have enough to pay for all the rest of the incomplete/untested games.
But, where do you store 150 games while you are working on them? You MIGHT be able to get them all in a large basement and two car garage, assuming you didn't already have anything in there.