> Gambling (also known as betting) is the wagering of money or something of value (referred to as "the stakes") on an event with an uncertain outcome, with the primary intent of winning money or material goods.
Seems like a fit to me. Even if the expected outcome is positive, it is still uncertain, hence it is gambling. If you go to the casino and count cards at the black jack table, you have a positive expected outcome, however you are still gambling.