Funny, I once placed 5th and still won 5 points. I also have placed 4th and lost some... No idea how this works as well.

@Zevox:
At least for me, whenever I lose with a low key hero, it always seems like it's because of mistakes of mine than, say, lack of luck or some other heroes hero power overwhelming me.
That, and rushed lightfangs. That strategy is thankfully going to be nerfed.