smart cards in receivers have a numerical limit of aprox 9 and a monetary limit of (i think) 60 bucks, also they will stay on the receivers sc forever and at a point after a ppv sits on the receiver so long the receiver will prevent more ppv's from being ordered until a smart card update is done. also once a receiver verifies that a phone line is connected you can order any ppv you want within those limits but there is a time limit to that as well. (try explaining, a three year old ppv that just downloaded, to an irrate cust)