You’re looking at this the wrong way.
Payouts are set by the casinos, typically by denominations. For example, penny slots often pay 89-90%. Terrible.
Nickel, quarter 90-91%. Dollar 91-92%. 5 dollar+ $92%+
Will say, I’m one of the few players to touch slots and make a profit in my life. I don’t play slots at all, I play poker. However a new casino had play $100 in slot, get free buffet promo so I gave it a shot. 20 spins at $5 each, leave after the 20th spin. On spin 4 or 5, hit bonus free games. Hit screen full of bells. 2700 win, $2150 after taxes. Wild times. Still don’t play slots.