Random comments on everything said so far:
@Babak: Dang, you are really addicted to the Ghost Ratings, can't you just wait to find out?! ;-) Plus, you can't know what everyone's GR is after the day it's posted, GR's change every day based on new games that finish, though you can get a good estimate if you really can't wait for the next months update. Hmmm, maybe Ghost should set up a site that instantly updates GR after each game finishes!!
@ strat: I'd argue that Babak did not play a darn good game as I don't believe a draw is a draw. A five-way draw is NOT a good outcome for the position this German had earlier in the game.
@abgemacht: I'll send you a message in-game, in response, I see no need to discuss in public. :-)
@strat: How your GR fluxuates varies, I recently wrapped up a three-way draw with TGM and I lost over 10

of GR, so it's not quite as clear cut as it may appear.
@Draug: It's okay to lose GR for "doing the right thing", I think over time it will sort itself out, especially since it is merely a rating system and should be more about documenting a collection of past performances rather than an encouragement of how to play out a single game.
@Babak: To estimate your change in GR, add up the total GR of all players in a game, divide by 17.5 to get the total GR in the pot. Divide that number by how many people were in on the draw and that's how much gets added to your GR, but make sure you subract out 1/17.5 of your own GR since that's how much you put in the pot (and lost) to start with. Again, this is just an estimate since you don't know anyone's GR this time of month, it can be much different than it was the last time GR's were posted.
Hmmm, this one's getting long, I'll type more in a minute...