Given the amount of cross-over we've seen over the years with these supposed brand representatives, I think at least some of them are just there to represent any product that needs a spokesperson. Some might actually be somehow tied to the brand, but it wouldn't seem all of them are. I even wonder if they're hired by the brand or by QVC. Some, like Linda Davies, seems pretty clearly to be QVC picks, given the number of brands she's now helped present on the air.
In my pantry with my cupcakes...