I'm not nearly as well versed on that system as I am DVC, despite owning for close to 20 years (which actually goes towards proving my point that the majority of DVC owners are not like us here on the DIS). So to answer your question best I can (which is to say not very well) it's severely restricted as to location and time. If you want to qualify the points I think it would cost you in the neighborhood of another $5,000 and even still I think they are still marred a bit. I will say that several years ago MVC offered us about $2,000 for it and we declined. Not sure if that offer is even on the table anymore. But for now we get way more use out of it than $2,000 so we kept it.
I have no idea what qualifying points means in this context but it triggered another possibility in my head - say you bought RIV on the resale market for $100 and a few months later DVC sends you a welcome letter with an option to pay $50/point to have full 7 month booking privileges at the L14. Now for $150/point you have full booking privileges, maybe not a horrible deal. Add that to the list of many many possibilities.