He'll have to use his commission to make up for the shortfall. If no one will rent him points he's going to go into bankruptcy anyway, so the same as if he just goes out of business now.
You are correct on the 153%/170%. Still 153% is a pretty significant loss. It doesn't really matter why an owner chooses to keep the money in that scenario. David's still has to eat the loss.
On which rate, they will be all new contracts. Owners who booked prior to February would actually get paid more for their points as they'd be under the new price structure. He could change the pricing structure again, but that's the same as those saying the vouchers expire in January. That's looking to make things worse without any actual proof.
They will get another trip. That's the idea behind the voucher. They aren't out anything but time.
The owner doesn't have to suck anything up. They can return the 70% and wash their hands of the entire deal.
There are plenty of agencies in this same spot. As has been quoted in this thread, Stubhub isn't doing refunds either.
And bankruptcy is a much bigger deal than losing a vacation or having to pay the maintenance fees that you contracted to do when you bought your timeshare. I get people are pissed about the situation, but get some perspective here.
Cancellations are on a rolling basis within 7 days of the check in date. They covered that in the closed until further notice PR. The governors order doesn't change that. We know they'll be cancelled, but the official cancellations will be on that schedule. I'm sure a lot of that is to make it more manageable on the call centers.
Just know that if it goes into bankruptcy, theres nothing that says that the courts can't come after the 70%. You may want to think they won't or can't, but they can. They only way you get a clean break is to send the 70% back.
Contractually it matters. The contract doesn't allow the owner to cancel the reservation under any circumstances. An owner cancelling the reservation is one of the things that actually spells out that a renter can get a refund. If
DVC cancels it, it gets us into this legal quandary we've been beating on. That may not apply in your case, but it matters to others considering cancelling before DVC does it.