For the month of May, a $50 Wally Mart card or a $50 Chevron gas card can be obtained for only $25 worth of points. It takes 8,333 points to earn a gift card; points are 1 per $1 coin-in. This makes the slot club return 0.6%, which is waaaaaay better than anything else you can find these days.
South Point has oodles of NSUD (99.73%) and JOB (99.54%), in a huge variety of denominations and game formats at .25 and up, so you can basically play for free. Couple that with the opportunity to visit the as-yet only real functional buffet in town--or, to scarf down a couple of $1.25 hot dogs--and this place is definitely worth a visit.