+1. Judicious use of sales technique definitely helps pitch the content better, but one can easily go overboard. IMHO, <i>the analogy actually goes in the other direction</i>, where one aspect of sales is trying to convey some information in an effective manner. Beyond that, sales is (often) partial in a manner antithetical to teaching (such as inducing a particular decision), whereas good teaching aims to induce enough engagement to make listeners think for themselves, and then help them along the way.<p>When teaching (as in sales), there is definitely such a thing as overselling.