in the 1.2.1 patch they already increased the pl gaining %. How much i don't know. I think i saw PCJoe say it was 3x's faster using melee than it was before. But right now your method sort of already takes place. I don't think you know how it works so ill tell you.
The less pl you have and the more your opponent has, if you hit him the more you gain pl. so for example say you have 700,000 pl. and you fight someone with 2,000,000 pl. you will gain more pl at a faster rate than you would someone with only 1 million. but if your at the advantage with pl, then you'll gain it slower and they will gain it faster. so it balances out. it all depends on pl.
so basically while your gaining pl, every hit you get less pl with each hit, yet its still going up. understand?
I like how the method works.