Just looking at my last 25 games, people I played:
I looked quickly so I may be wrong, but that amounts to playing people in the top 100 in 3 out of 25 games - so 12% of your games. My point still stands, you should not be gaining ranks very quickly when the vast majority of your games are against people way under your rank. Conversely, when you do lose, your rank should drop quickly because of the level disparity. That's at least how the ELOS rankings work. If the number 8 guy in the world plays 50 matches against people ranked 1000 - 2000, he is not going to move up the ladder. If he loses one of the games, he is going to fall far.
Basically, the ELOS system sets up a big disincentive to play people with ranks much lower than you. You have nothing to gain and everything to lose. That's not necessarily a bad thing because there is an incentive to play people within your skill level.
Also, I'm not saying you are doing anything wrong Sarmis. We get games where we can because of the bad matchmaking that we have. All we have are custom games so the higher the rank you are, the more difficult it will be to get a game that will boost your rank. I'm just not surprised that you played 15 games without increase in rank when one lose pushed you down. That's what it should be like. Where I am surprised are all the people that are in the 30K+ rank that have 50%+ win rates. Something is truly messed up with those stats.