I really don't like this idea for multiple reasons...

1. There are all those people that have the billion $ guns...
Enemy Vision - I think I want to sit here and camp, and spray my gun fire around.
Your Vision - S***, I hate this PK.

2. Yea your kills would go up, but would you get anything else as a reward?
Enemy Vision - Its so fun to kill people HAHAHAHAHAHAH... Wait, I get no reward. Screw this.
Your Vision - Yay they stopped! *New Players Join* WHY GOD WHY?!

3. Im pretty sure people would sit at the doors and wait for you to walk by. How would you do missions?
Enemy Vision - Im gonna spray at this door and hope someone walks in. LOL Im a troll.
Your Vision - I am a poor man, because I cant do my missions. *RAGE QUIT*

Keep this in mind. :3