Resale restrictions aside, the big differentiators to me are location and size.
RIV is an Epcot area resort, not a Crescent Lake resort. The walkability factor is what's propping BCV and BWV up with so few years left on the deed. BCV also has what is probably considered the most desirable pool overall at WDW requiring recreation CMs posted at every entrance to wristband guests plus it's a very small
DVC property.
It's like the MK resorts. VGF never tanked in resale pricing before BPK because of it's size. The sheer number of contracts on the market combined with the fact that Disney had a waitlist and would ROFR your contract made it more competitive. VGF didn't even have a walking path before BPK, but it was selling higher than BLT resale which is a much larger property with only four less years on the deed.
Size and location is what also keeps SSR resale low compared to other resorts and SSR dues are lower than RIV.