COTM is pretty much a joke. Just look at the cars that got picked in the last 6 months. I think it doesn't matter how many votes you get, the owner of this site picks the COTM. And he happens to like stock M3's. There was one that really stuck out to me. A white E90 with a terrible looking diffuser thing and otherwise stock and it got COTM
When that car got picked it showed me that COTM is bullshit.
Don't worry about it man. Your car should have been COTM hands down. Actually, looking at the other ones that are up there, you're better off NOT being COTM these days.