Aimpoint is a great optic. I am in the process of moving mine on to a gun I like more but shoot less because I dont like the optic thats on it now very much.
However, the ACOG is on the gun I shoot most. The thing is, the ACOG does everything the Aimpoint does, and more. Yeah, you dont need magnification at the ranges you are talking about, but it does help with several things.
At FDCC, once in a while we'll set up an end of the match shoot out. But 5 rounds in a scored target. Target is never more than 50 yards away. Last time it was at 25. First person to finish gets 5 extra points. So there's this balance of trying to take your time and shoot 5 well placed shots into a very small 10 ring and trying to get the 5 extra points by finishing before the other two shooters going with you. Needless to say, ACOG users win that event every single time, without fail. The magnification has also helped shooters with target identification at closer ranges (under 30 yards) when it was not immediately obvious if the target was a threat or not.
I realize thats gun games of sorts, but I also know that it absolutely has implications in the real world. None of this is to say that you need an ACOG over an Aimpoint. Not at all. I will never get rid of my Aimpoint. However, I do like to try and point out that magnification is helpful for things other than distance shooting.