I've played lots of solo games and I've once come across a situation where I believed this would be the case. The honest truth is I can't be bothered to go through all of that work to report a player, or a group of players. While I don't doubt that it's happening, it's not as rampant a problem as this thread would lead you to believe.
Let me clarify, I'm not condoning it by any means. I'm just saying I think were getting a little carried away with something that in reality, doesn't happen all that often.