perhaps a solution??

~ AFK / DC ~ so because this wouldn't effect the enemy team other than them most likely winning (not that 4v5's haven't happened) basically the winning team would earn the same amount for the game as was predetermined upon entering the game. However, if you were on the losing team and this was a result of an AFK (or leaving the game, via the "leave game" button) you would lose half of the Lp that you would have originally lost, however the AFK / ragequit* will lose their original amount that they would have lost for the match.(maybe tack 5 off for repeated offense within a certain time period).

This way those people that are climbing aren't being saved by someone afking, because they are still losing Lp , buuut at the same time someone who would get gouged by the current system - 24Lp because Amumu got invaded early and ragequit... instead -12Lp, which would be similar to what they would gain from winning that game because of how the mmr system currently works... this way u still lose points for a loss, which u should (yes even if its not in your power to fix or otherwise, because this does happen and people are on both ends of it.)

The obvious exploit would be to duo with someone on a smurf or not.. and if a game was going bad they don't mind taking the hit.. well that's on riot to step their game up for repeat offenders of people leaving game... as a computer scientist major, the logic for this sort of stat tracking on AFK's really would not be that difficult, and I am 100% positive their team is capable of it... in fact its probably already implemented for other reasons.not legitimate

I feel like this is the best way to go about it... and here's the thing even if people were to exploit it, whats the difference in that or boosting or any other form of getting ahead in a way that is not legitimate.. you might as well let those people be those people... whatever let them live on their fake high horse, but this way the people who are putting the effort in to learning the game and into actually trying to enjoy the competitive side of it aren't getting that experience ruined because joe shmoe is still running dial up and his mom needs to make a long distance phone call... or somebody is tilted so far they hit the leave game option...

just a thought, whats yours?