Dude...Tips work a treat.... Few dollars here and there and the barstaff keep you well I generally tipped $5 - $10 to a barman and trust me i dont know how they do it but they remember you and as soon as i hit the bar i was served while people that wait wonder why? Tip People!
Most places offer a reduced rate for entrance if you choose to buy your own drinks. Or places will offer no cover for the ladies