I was struck by the H&R Block ad campaign, claiming that Americans who did their own tax paid an extra billion dollars last year, enough to put $500 on every seat in every pro football stadium in the U.S. I got to thinking about how, while that sounds like a lot, and seems to imply that people stink at doing their own taxes, the ad might actually indicate that we “self-preparers” do a decent job at it. Firstly, the ads each feature small print stating, “In a study of self-prepared ...