Have you ever been tempted to throw away a Full House and go for the Four of a Kind? In a Jacks or Better machine this is essentially a suicidal move. The Full House is obviously worth the full 9 EV. The Trips is worth only 4.3. Further, it is not like the Quads will pay some significant amount of money. Quads paying only 25 doesn’t seem like enough of a payday to even contemplate giving up that Full House.