"....according to Gene !! The Palms machines are estimated to 'cost' $13.50 a piece to win on average."

I never said this. I told you I saw a post where Norman Clem said it.

"I estimated the average payout on the machine including jackpot was 75%"

You and Terry must be using the same calucator.
SS machines are preset at the factory and all are the same.