[jermaustin1]

I ran the number on one that my wife and I would go to in Pennsylvania, and just based on the people I'd see checking out each time I was there, they made decent money.

Their model was, you give us a book, we give you $0.50 off a single book purchase. All books are $1. So if you gave them 25 books, you would get $12.50 in credit, but can only use $0.50 per book you bought. So you still end up giving them a profitable transaction. And most people didn't use credits to buy their books, they went in, and bought 10 books after perusing for an hour or so.

It's such a good concept, I'd like to try it some day in an area where there is enough of a population within an hour that it makes sense.