David Sirlin wrote an interesting analysis on why Olympic badminton players would lose intentionally, even for relatively honorable goals (rather than bribery or betting):

It’s LAUGHABLE to put even the tiniest amount of blame on the competitors who are playing to win here, when the tournament rules so clearly, so obviously, and so predictably have major problems…It’s an embarrassing time for Olympic badminton. But not because some players lost on purpose–because someone created horrificly bad tournament rules and then tried to blame the competitors for playing to win.