Yes and no, there are benefits and negatives to both systems, rewarding IP on a time or turn basis. The negative for having it as it is, is that some people, for whatever reason, value TINY
amounts of IP more than enjoying the game. These people stall turns intentionally to make the IP for that match increase. (usually to optimize gains from a match they are winning) Other times they will stall just to piss you off when you are winning. These are pretty rare though and would exist in many cases no matter what IP system they go with, so I generally give it a pass.
There is a whole thread talking about it somewhere... I think in the "Infinity Wars" section. (I don't know why the category exists when the whole forum is Infinity Wars but meh)
Looks like it isn't sticky'd anymore though.