Web dwell time increased by promotion stickiness

A new study published  in Marketing Profs  focused on the benefits of keeping a visitor longer on your website. No surprise that the longer someone stays on your site, the higher percentage of conversions you get - as much as 45% higher based on minimal increases of 5% to 15% in "dwell" time.

I was excited to see these results.  Dwell time is a measure of stickiness which is a fundamental principle we believe in.  The longer you have someone engaged, interested and paying attention, the more effective your promotion will be.

So why do we continue to see promotions that are boring, offer no interactivity and don't drive responses, including web visit?