How to improve the IP system

Quoted from /u/ElGrek0 on the LoL SubR. Original post:https://www.reddit.com/r/leagueoflegends/comments/3iviu2/the_actual_problem_that_resulted_to_the_ip/

The way id like ip gain to be would look like the following

-up to 20 minutes of gameplay

      Winning team gets huge rewards for a deceicive victory
      loosing team gets a minimum

-20 to 40 minutes of gameplay

        Winning team rewards becomes steadily less while
      loosing team reward improves encouraging a team to hold on as long as possible

(a lot of people that expect short games might not like this) after 40 minutes

The rewards are close to even with the winning team getting a bit more as a reward for winning but loosing side should get an amost equal reward for holding on that long.

with an added graph here http://i.imgur.com/25SBVfM.png