No one in their right mind would sell a single location that was making any sort of real money. He probably isn't making enough there to even cover repairs, annual tax stamps and the drive to the place anymore. It wouldn't surprise me if he was seeing less than $200 a month from that equipment.
At his price to recover your investment in 2 years (assuming zero repair expenses, zero collection expenses, a 50/50 split, greedy settings on the Claw machines, and no tax stamp expenses on the machines), those machines would each have to see 10 plays per hour, 10 hours a day, 365 days a year for 2 years, and that is just to break even. I doubt the best earning machine he has even sees a fourth of that. At 10 plays per hour that would mean the machines would all have to be occupied constantly.
Even at $10,000 you would probably never break even. At $5,000 you could break even, but only by selling the equipment.