This is my understanding and correct me if I'm wrong.
Owner's have two choices. Keep the 70% and keep the points. They can then take those points and see if they can use them personally, or try and rent them out again which means further profit. Worst case, the points expire and they lose 30%. Second choice is to allow David's to re-rent the points, and then get 100%. Overall, it's not perfect, but it's not too bad.
Renter's get one choice. They get a voucher which can be used for several different options including a future DVC stay, or a booking through his
travel agency (which could include booking hotel rooms through Disney). Again, it's not a perfect solution for the renter, but it's still overall not that bad.
In order to allow the owner to keep the 70%, and then issue a 100% voucher to the renter, that requires excess cash. Doing some rough math, David's in general keeps about 24% of the funds as a commission. Now, he gives a chunk of that amount to his employees as their commission. So l assume he (the company) only keeps about 13% as gross profit (which is different than profit. He still has other expenses to cover) under normal circumstances. So far, the owner has received about 53% of the total funds (14.50 / 19 x 0.7) that the renter paid, the employee has about 10% (2 / 19) , and David has 37% (1 - 16.50 / 19). Still following me? He now has to cover a 100% voucher with only 37% of the funds to help. He is taking a 63% loss. Which means, he is taking a major financial loss on those vouchers.
In the circumstances where the owner allows their points to be re-rented, everyone is technically made whole. In the circumstance where the owner keeps the 70%, David is taking a major financial loss, the owner is taking a smaller loss, and the renter is taking zero financial loss (they are taking a qualitative loss). Yes, some of the terms are a bit different on the voucher, but these are basically the terms that everyone is saying were missing from the original agreements that lead to the mess in the first place. Again, it's not a perfect solution, but IMO it's about as much as you can ask for given the scenario. All three parties are sharing the loss, with the broker taking the the brunt of it.