In addition to linking to Letter Shoppe's designs (available on merchandise that is ultimately sold by RedBubble), the email campaign includes an endearing quote by the Featured Artist: "Never compromise on your values, and only do work you want to get more of." RedBubble's customers are likely to agree -- and open other emails in this campaign for more inspiring quotes.
That isn’t to say that sales-y promotions couldn’t ever create results—as marketing “gurus” have proved. The results just aren’t as good as they could be. Take the biggest gurus’ results—the ones they boast about—and calculate their conversion rates. Often their marketing is comparatively ineffective. They just have massive volume, so the sales numbers are impressive.