It's essentially the balance between 'meh, let's throw the game and give our opponents free points' and 'we should try our best even though we're knocked out'.
Dark's case was little different.
1. They certainly could've tried to get 1 point, then get 3 points next time around. This meant that they had a chance of qualifying, a.k.a. they trolled before getting knocked out officially
2. Their opponent was not knocked out, so the results of the game did matter.
3. After their picks and bans (which was cute, I admit), they intentionally threw the game and started playing Gomoku with wards (...?). Why waste the fans, casters, and OGN staff's time with useless game that's being broadcasted as "professional" e-Sports?
To above poster: It wouldn't be as big of a problem if they TRIED to win and showed some professionalism after the troll ban/pick.