The first time I recall this being discussed was soon after I joined the board last year.
Another poster (Homemom) and I were both ROFR'd around the same time, twice, while being on the wait list for points from Disney at VGC. Not just having taken a tour, but on the wait list. And while my contracts were ridiculously low priced, Homemom's were actually priced higher than others that were passing at that time.
The kicker was, in both our cases, our guides called us right when we were ROFR'd. In my case, he called that very night, sounding sort of smug, "Anything new Brian?", and told me my points were coming soon.
So. yes, it's just an urban myth, but since no one knows what DVC uses as the criteria for ROFR, being on a wait list for points could easily be a red flag. I mean, they know you are serious about buying. Why not force you to go through them rather than lose that sale to resale?