Utilizing Champion Master Rating Effectively (possibly)

So I was thinking and maybe this has already been discussed but why not allow the mastery ranking system dictate somewhat the amount of lp lost/gained as well. Especially in solo rank where you have an absurd amount of people who troll, afk, not good etc. Like take for example you were given an S or an A rank and still lost a game it would be less lp lost because you played your champion correctly. This also in turn would allow more people from forfeiting games, intentionally feeding, or even afk because they see other teammates doing poorly. Its just a thought but I think it would make the game much more incentive based to actually play well instead of the occasional "I'm done, You fed, We lost" etc. I also think that this will help out players realize that their still can be hope as certain team comps are much better late game. I am sure that when people read this they are going to say well that is something someone in bronze would say but in all honesty I feel that it will make the game more competitively in solo rank specifically with people not having such a negative attitude and rage. This will allow for each player to focus on their position and how they do more specifically as opposed to countless times where everyone worries about other team members game-play. Reason i brought this up is because I recently was in a 4v5 match where we had lost and I'm sure all members were at an A or better and I lost 20 points because someone afk'd for entire match. Plus it was a good match and almost won which was upsetting. Interested to hear what people think about this...