Alan, here's an old newspaper article about AP's at Sands Bethlehem paying the homeless for generic slot cards with freeplay on them. The homeless came out of New York City on busses everyday by the thousands. They had to pay $15 for the roundtrip bus ticket but got a generic slot card with $45 in freeplay when they got to Sands Bethlehem. They then sold the cards to the AP's for $40 each. An individual AP might be buying hundreds of cards a day. To the AP it equated to a 12.5% add-on. That left plenty of room for profit when playing 97% and 98% games.

https://www.google.com/url?sa=t&rct=...pjKKfFdqaymrnv