Quote:
...but I'm pretty darn sure I remember reading something from Luke that low usage only affects HRs.

You may remember it, but I don't think Luke actually wrote it. :-)

Batting average is also regressed toward the mean for low-AB players. Somebody ran some experiments and posted the results some time back (maybe even a couple of years ago). I think the effects of the regression tapered off somewhere around 50 AB, though my memory may be no more reliable than spos's.