It's not my fault if they are doing their own thing. I can do stuff to assist them to the best of my ability, but I can't help it if they are a bad player. You know this. Stop trying to squirm out of it with your pedantic arguments.
Theres a video of me babysitting an AI the entire game against decent players, it's entirely possible so i don't "know this". oh, AND we were losing before the drop. http://www.youtube.com/watch?v=QwqVHdhoYiU
And concede only works if other people on your team concede as well. A lot of the times this is not the case, so I am presented with the option of staying in the game and wasting my time, or quitting and being replaced with AI (which is unfair to the good players on my team).
If there are "good" players on your team, then you wouldn't be in such a bad position anyway. There's no reason why if you quit, the other good player on your team couldn't quit as well if your partner is the apsolute dismal failure you claim them to be.
Diminishing returns for killing the same player is not "rewarding failure". That's the most fantastically retarded logic I have ever seen. Diminishing returns for killing the same player is "decreasing punishment for repetitive failure", and "decreasing rewards for farming the same player over and over". I think both of these are pretty fair.
It is rewarding failure. Your oponnents don't get the benefit they do as they still give the other team more money. Decreasing punishment for repetitive failure is still a bonus that is given to you due to your failures.
The biggest problem with this whole idea i have is the strange fact, you want this game to last longer when it appears to be a total steam rolling. To me, I would think you want the game to end sooner.