Back in 2012 when I bought one of my BWV contacts, the contract came fully loaded with three years of points and the broker told me that the owner had also had 3 years of points expire without using them. If that owner had of known about brokers all those points could have been rented out instead of the owner paying for them and not using them. Now I suppose that if you didn't own at BWV you'd be thinking this was great as it would give you more chance to get into BWV.
DVC is meant to be full all year long and DVC has been increasing the number of members and points in the system by a huge amount, but there is still only the same number of AKV value rooms, or BCV studios, etc. So you've got more competition for the same number of "premium/preferred" rooms. Basically if everyone wants to go at the same time and wants the exact same room, then a lot of people are going to be disappointed.
I've got no interest in ever going to Alauni, VB or HH, but I'm pretty sure owners at those resorts exchange into WDW.