i typically play nine or ten numbers - 4 coins per hand (i alternate between nickels and quarters, depending on where i am in my budget)
i love playing the four-card nickel machines at the el cortez. first card is three numbers, second is seven, third is the same seven from card #2 plus two or three more (wins are then double dipped!) and then the fourth card is always ten numbers quick pick.
ive gotten 10/10 one time - of course, on nickels. sigh.