Food marketing (if you can call it food)

Speaking of things people on the Internet believe to be the worst food or drink product ever created by man, here's what happens when you buy Hot Pockets, Lean Pockets, and/or Croissant Pockets: the cash register spits out a coupon that's good for $1.00 off the number of Pockets you bought, plus one. Buy two, get a coupon for $1.00 off three. Buy five, get a coupon for $1.00 off six.

If I had more money and more freezer space than I do currently, I'd attempt to buy all the Pockets in the store's freezer case, just to see if the numbers keep going up and up, you know, buy 146, get a coupon for $1.00 off 147. But in real life, I haven't even gotten the courage up to see what happens with the "warehouse" package of Hot Pockets. It contains 12 boxes, so would the coupon be for $1.00 off 13 boxes, or $1.00 off two "warehouse" packages?