Originally posted by PsychoPawn
Your rating also could go up just by choosing to play much weaker players. It won't grow as fast, but it will grow.
I don't know the details of how the ratings are implemented on this site (other than looking at the formulas), but that shouldn't be possible if they're implemented correctly. The amount you gain should round down to 0 with a sufficient rating difference.
If you win against any player exactly the % of games you're expected to win, your rating shouldn't change.
Your rating only goes up when you win at a higher rate than the calculated win expectancy.
In fact that is the whole principle that makes the ratings meaningful. They predict an exact win percentage between two players. When the reality is that the win percentage is different than that, the ratings change.