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The cash or equivalent.
If 10g coin in gets u $100 cashback, that is 1%
If it gets u a room that costs $400, But u would have spent $50 for a different room that is .5%.
Free play:
Let's say on a $5 machine is 400 plays.
If they give u 4 free spins that's 1%
Or
U r only giving $9900 in action for next play
There may be a better way to quantify this.
U have to keep track of amount played and what u get back & use.
How do u value a dvd player? Is it money saved? It's mostly subjective.
Basic tournament equity is total prize money divided by number of players.