Just curious, what is the "reward" of the punch card? What do you get after so many punches? and how many punches before the "reward".
For what its worth, I would never ever pay for a punch card. If a quilt store is looking to get my loyalty, have a changing variety of fabrics, have competitive prices, sales or specials, classes, fun events, offer the intangibles like customer service, friendliness, willingness to go an extra step, basically, treat me like they are happy to see me and that just my shopping in their shop is good for THEM.
A shop I know of has a reward program run through their cash register system, after spending so much money, you get a preset cash reward to spend as you please in the shop. The customers don't have to do anything, just give your name when paying and it shows on your receipt where you are in the accumulation of the set amount.