I got to tell you that in "reality" your Karma is all fine. I just investigated that tonight. Right now, no Karma rating at all is better than just 1 good rating. It sounds odd I know!
Case 1: If you are a virgin user. Wich would means that you just created your account yeterday, never posted anything and has never been Karma rated. Your Karma rating would be straight 50.
Case 2 : If you are an interactive user that posted some messages in the forums and stuff in the gallery. And you has never been rated, then your Karma should be around above 50, let's say maybe 55.
Case 3 : Then here is where it starts to doesn't work properly. Like if you are an interactive user and got rated positive a few time, your Karma rating will go down.
Other cases (few negative ratings, a lot of positive ratings, a lot of negative ratings) : I don't know much what really happens.
In clear it means that even if you got rated up, if it's just a few time, your Karma will go down. And here is the proof. I retrieved the Karma you received from other users. And it appears that you only got voted once. And here is the result :
And here is an other example. Before tonight, I only got rating above 5. I guess that 5 or above 5 is positive since they only clicked +. And as a user, I uploaded a bunch of pictures and videos which they got rated pretty good. Also, I am a donator. So, my Karma should be good no? Not really, when I checked it, my Karma was at 49. And personnally I got a bit frustrated of that in the past. I wondered what I could had done wrong to get that.