Pretty basic really. If your team is over 1000 points behind the team in the lead, your team is removed from the match with the basic rewards you would've gotten. There's no reason to force a team that is clearly screwed to continue to play in order to make the other teams feel superior. Hell, the losing team can't even withdraw from the fucking match without getting hit with the 30 min lockout, regardless of if they left after 10 minutes. Most people playing pvp are doing so for the event and since the event gives jack for losers, why keep them locked in?