Authors:

Anytime you make a bet with the best of it, where the odds are in your favor, you have earned something on that bet, whether you actually win or lose the bet. By the same token when you make a bet with the worst of it, where the odds are not in your favor, you have lost something, whether you actually win or lose the bet.

David Sklansky (1999). “The Theory of Poker”, p.10, Two Plus Two Publishing LLC
Anytime you make a bet with the best of it, where the odds are in your favor, you have earned something on that bet, whether you actually win or lose the bet. By the same token when you make a bet with the worst of it,