I was using my IP win bonuses on regular games because I thought they would give me more IP. Then I realized that I do so well on Co-op that I probably average more in Co-op games.
Everyone but completely new or absolutely stupid people do well in co-op.
You also get an exp/IP cut at a certain level, then you eventually have limited minutes per day to get any reward from it.
You better get used to normal eventually.
It's also IP bonus for wins. So if you lose, the boost doesn't work, but you also don't lose one.
Have fun wasting it all.
As for me. Now I know why they call it ELO hell.