By this logic:

- I buy stock that doesn't perform how I expected.

- I hire someone to produce art.

- I pay a lawyer to represent me in court.

- I pay a registration fee to play a sport expecting to win.

- I buy a gift for someone expecting friendship.

Are all gambas.

You aren't paying for the result (the win), you are paying for the service that may produce the desired result, and in some cases one of may possibly desirable results.