Is this the result of a marketing plan or another programming glitch? My vote goes to another programming glitch (a euphemism for "error"). There have literally been dozens of them. It seems as though every time we turn around an owner has discovered another HomeAway programming glitch.
Added - by the way, the Vrbo website is "down" at the moment. I just tried to take a look at my listing and received "Sorry - we'll be right back" and "Please try again later."