My suspicion is, and has always been, that either QVC actually owns the line outright, or that David has a major investment in Temptations. Clearly he and Tara are great friends and neighbors. QVC treats Temptations in the same way they treat Susan Graver, whose line I am sure they own. I also feel this is the case with LOGO NOGO. It's overkill IMHO. But since I don't watch ITKWKD, I only see it on Carolyn's shows or clearance offerings.
I don't hate Temptations, but don't love the line either. Don't care for Old World or Floral Lace. I have some holiday items that I use from Christmas through February, and a few "pumpkin things I use around Halloween and Thanksgiving.. But I do not cook in them - just use for serviing and decorations. I much prefer my plain Pyrex and white Corning Ware. I feel food looks much more appetizing in a plain container, rather than having to compete with decorated pieces.