
Falling behind the win line wouldn't affect my score. We're not counting wins against losses, we're counting points. And due to inflation, we get free points from people who don't even play.
If I'm correct, the reason for inflation is new players signing up, playing their four games then either forgetting to check back in again and deadbeating or just losing and never coming back. Now we have an inactive account that isn't going to take or give any points, and it only exists in the archives. We also have an active player who has basically gotten his points for free (in the case of a deadbeat) or from a source that he can never give them back to. Then the points can only be taken from him by other active players, and the better active players (at the top of the scoreboard) will get a big chunk of them.
On a very small scale, imagine that there are 100 players. They have a total of 100,000 points being distributed amongst each other. A new player joins and loses 100 points to the active players. Now there are 100,100 points in the active players' points pool, and each of them has an average score of 1,001, one point more than they used to. If 9 more deadbeats were to join and do the same thing, there'd be 101,000 points in the active player's point pool and the average score would be 1,010. So as time goes by and more deadbeats join, the point pool gets more inflated and the average scores of each player goes up.