Ah - But you didn't pay for or own the Bally
Ballys (KISS, Paragon etc) cost around US$650 NIB in 1979. That was A LOT of money back then. There was no such thing as a collector. Pinballs were only bought to make money, and when they were superceeded, they were thrown away or stored in warehouses.
A loaf of bread cost how much in 1979 ?