Nah, don't go just yet. It does happen for me quite often, and it has to do with the servers you choose, of course (we know that), and I'm still positive it will get better again. And as for leagues, OLFSL for example (I'm sure there are others as well) is a quite casual league. The current season has ten events and if I'm lucky, I might be able to participate in 5 to a maximum of 7 events. But that doesn't stop me from participating at all, because I'm not going for the overall win (as if I had a chance, lol), just for each individual event and the practicing in between (always a good chance to find courtious ppl who are as well practicing for the upcoming event).
And btw: Your arithmetic is wrong, I think. It's more like this :
http://www.madeasy.de/2/gauss.htm
or this, if you don't feel like reading all through it
http://www.ms.uky.edu/~mai/java/stat/GaltonMachine.html