Winning teams only contribute 2.5 points to pool party

The joke with pool party, which requires either teaming or spending real $ to earn points for the community is that you only contribute 2.5 points each time you play instead of 5. Why? Because if there is a group pool of points, and that pool increases by 5 after two teams play, then there had to be a loser and a winner of the match. In other words, you cannot increase the community pool by 10 points after a game, because that would mean both teams won. You are incapable of increasing the pool by 5 points without another team increasing the pool by 0.

Funny enough, the fastest way to earn points for the community would be for a team to surrender at 15m every game in an ARAM.