How about instead of loss prevented when somebody is AFK, we gain more LP if we win?

We all know loss prevented will never work because of people flamming people into leaving and etc...

So how about we gain a bit more LP(5-10) on win instead? I have won many 4v5s, even one just now as URGOT and this thread was totally not made to advertise that . It would encourage people to play when they see 4v5s are not all completely hopeless instead of surrendering at 20 just because it's not worth the time.

To prevent abuse the player would need to be afk for at least 15-20 minutes, which means usually the game is 4v5 from the start.