The goko ratings are way way too swingy and hugely depend on your latest results. Of course, the best players tend to have had good results in the recent past too, but, you know.
In all fairness, the goko ratings have been made so swingy to get rid of the cheaters that "quitted" their way up the leaderboard. They were less swingy before, and eventually they will revert this to normal soon.
If i look at the goko leaderboard, if find names in the top spot that eventually belong there, and all of the cheaters are gone. For me thats a good sign: swingy or not, the right peolpe are at the top.
quote from getsatisaction on this very topic:
You are right: the subtraction is too tough now. This is on purpose because we had a situation where some people were cheating their way up the leaderboard by quitting (before quits were penalized) and setting it tough means that you have to actively play -- and play at your rating level -- in order to maintain your rating. It's a little more like "king of the hill". Remember, it's happening to everybody, not just you, so it's fair. But now that the overrated quit-cheaters have had time to drop, it's getting time to revert these setting to be more moderate.