Or your team is near the bottom of the standings and is scheduled to throw against the first or second place team. If you are throwing in league play, you have teammates who will try to do their best, despite the situation. Since the objective is to get as many wins as possible, giving up and allowing your opponents an uncontested victory is helping your opponents reach their objective lots more than helping you reach yours. And it's real easy to know when this is going on. Your teammates will not be happy about it, and I don't blame them in the least.
Defeatism has a tendency to spread like wild fire.
Now you have even fewer people trying to win. If you are throwing in a blind-draw doubles tournament, I can't think of one thing that will infuriate your partner more than defeatism. In most cases, your partner focus is no longer on the game. The focus has become trying to get your head back in the game. Most of the time, you and your partner are going to make an early exit.