Breakage

Noun

1. The act of breaking.
2. Something that has been broken.

   "At the end of the party, there were two reported breakages."

3. A service which is unused by a customer, such as an unredeemed gift card, which therefore represents a pure profit to the seller.
4. The left-over money in a pari-mutuel betting pool resulting from rounding off the payoffs, added to the pool for the next race or event or kept as profit.