To answer the OP's question, we bought direct at Riviera as new
DVC members simply because Riviera is NOT the Grand Floridian. In our opinion it has the same elegance as the Grand without all of the baggage.
The cozy Riviera lobby doesn't turn into a fifth gate during the holiday season like the Grand Lobby does (ever see what that does to the Monorail queue?). ALSO, as far as we can tell, Riviera is one of the few Disney Resorts that has it's own dedicated bus stations, and doesn't seem to share with other resorts, unlike the Grand.....
I can go on, but it sounds like a lot of GF stans have an axe to grind with Rivera for merely existing, so it doesn't seem that I will change any minds sharing my 2 cents.
PS....we totally love the Skyliner as well, less mass transit vibes when compared to the monorail.