I'm surprised this is the first I've heard of designer-signed holders, as a I thought we'd see those day 1 (although a lot less than $350). I suggested to my brother-in-law who possessing artistic talent that I don't that he enter the design contest and thought to myself that if he won, I would have tried contacting TPGs he could make well-beyond the $5,000 prize by having his signature appear in special
TPG labels. (postscript: he thought of some ideas but didn't enter, and his vision was markedly different than the design selection anyway, so he probably wouldn't have won had he entered).