Well the most I got back was in the double digits, but like Frob said when your roll only allows you to play for pennies, nickels, dimes and sometimes quarters, you can't expect silk from a sow's ear
As for a goal I'd like to get my br to a comfortable level, and then in turn increase my
rakeback return. BUT...I will never risk my bankroll simply to seek out a higher rakeback return...that is a huge mistake and many people do it.
