It doesn't matter what you paid or what the annual dues are, what matters is what someone is willing to pay to rent the points. That is more related to the cost of other hotel rooms on property than it is to the costs of the
dvc contract. If someone says "Oh, I can pay $20 per point and save half the cost of what booking a room through disney would be," they'd probably pay $20 per point. If someone says "they are asking $9 a point, but I wouldn't save much more than it would cost to book through Disney with code xyz" then they probably wouldn't.
For example, say you are trying to sell a used car. I don't care if you paid $30,000 for it and have paid a ton in insurance to drive it. If I can get a comparable used car for $10,000 I'm not going to give you $15,000 for yours, no matter how much you have in it. I don't care what you have in it or what you want out of it. So, if there are a lot of people buying cars, the costs of cars will go up and I'd be more willing to pay what you want. If there aren't people buying any cars, the cost of cars goes down and I will buy something else.
I'm not saying that $10 per point is the "right" cost or anything, I'm just saying that what people are willing to pay for rentals is more based on what they compare the costs of other options to than it is to what DVC members pay. Although I do expect that as rooms at wdw become more costly the costs for DVC will to, so there would be a correlation there but I'd argue that it is a spurious one. The price to rent points has to do with how many people are wanting to go to WDW. If a lot want to go, there won't be discounts on rooms and disney will charge more for rooms and people will be willing to pay more for
dvc rental. If travel goes down a lot and disney has a lot of rooms open, they will have discounts and people will not be willing to pay as much for the room.
If people want to ask for more to rent their points they should.