I think that's mainly an artifact of 3rd Edition.
I keep wondering if its also an artifact of the point buy number. For example, in 3rd edition the technical point buy was 25 points for a normal game. I don't know about the rest of you, but my group never played with that. It was 28 at the minimum, often with 30 or 32.
I wonder if 4e will see a creep in point buy. With that, people may not care as much, because its easier to get your 18's and still get a few other stats, etc.