I don't recall seeing this form before. I found it in my Miami Beach documentation envelope. Bally advises operators to use the meters to tell if the game is too stingy on payouts. Somewhat curiously, they suggest no ideal plays/replays ratio.
Bally Form 1500, page 1 - Plays vs. Replays - Don't get greedy (resized).jpg
Bally Form 1500, page 2 - Plays vs. Replays - Don't get greedy (resized).jpg
Bally Form 1500, page 3 - Plays vs. Replays - Don't get greedy (resized).jpg