There have been some that have tried more dynamic pricing in the past - bipbop is one that comes to mind that is now out of business.
Brokering points is a scale business where you need both a lot of supply - ie people with points they want to rent out, and a lot of demand - ie people wanting to rent others’ points at the same time. Getting both sides of a marketplace to grow at the same time is a tough business to start from scratch. You need to grow both sides at the same time and to have both sides trust you as a business. The biggest players are entrenched and get to monetize the network effects and trust they have grown over the years.
I’ve seen a lot of sub scale brokers come and go through time because they haven’t been able to get to scale
DVCrentalstore recently upped their percentage take of the transaction - most likely because they are such a big part of the
DVC point rental market that their position is strong enough to be able to improve their own bottom line without significantly hurting their volumes.
Although I think their take of what is now greater than one third of the economics is too much for the service they provide it appears to be working fine for them. They have built a great capital light business that has to be a cash flow monster. I’m no longer renting my excess points through them but it seems like others still are.