Except based on your example that is correct. If DVC allowed you to upgrade though it would be for $75-$100 (more than they make on ROFR) and be required for all points on your contract not just 100.
If anything doing this model is way more likely because as Disney has now found out they can be doing ROFR and then all of a sudden get stuck with a bunch of contracts/points.
Also by putting out an upgrade cost they will push resale value lower allowing them to ROFR for greater profit if they wanted to. The reason resale will go lower is people will do the math and decide they want the option to upgrade someday for no more than direct prices.
Again, the Disney juggernaut wants to have more outstanding points. They didn't ROFR a ton of stuff before and they are pretty much out of the market now. In spite of them being out of the market, resale prices are holding up pretty well for now.
More outstanding points means more MFs, more people coming to DisneyWorld, more tickets sold, more food sold, more tchotchkes sold, more money in the coffers. So they want more outstanding points.
But let's go with your $75-100 to upgrade to get a blue card. Anyone who paid that amount to upgrade their resale gets my vote for the Darwin award in finance because it's cheaper to sell your contract and buy direct.
What I haven't seen written yet, and what people should be able to recognize is that DVC is just another loyalty program, no different than airline, hotel, car, even restaurant loyalty programs.
The entire purpose of corporate loyalty programs is to get members to spend more money with that corporation. Bolded because that's EXACTLY what DVC does. It is all about getting one in the Disney bubble on a regular basis and have you spend every last dime on Disney stuff. And with DVC, they're able to have you spend money on Disney lodging every month so that when you get there, the money you've got saved can all go to other stuff.
I've chased hotel loyalty programs over the years and had top status with most of them (Marriott, Starwood, Hyatt, Fairmont, IHG, Hilton). Every single one of them (same goes for other industry loyalty programs) give you small perks so that you spend more money with them. I don't chase airline programs because I have employee benefits but that's the same setup. Same with my Hertz and
Avis status/loyalty.
Even restaurants have caught on to this, such as Landry's Select Club, Bloomin' Brands (Bonefish Grill, Outback, Carrabbas) Dine Rewards, Lettuce Entertain You, El Pollo Loco, Smashburger, Red Robin, Pizza Hut, Papa John's and a bunch of other restaurants have caught on to this and offer discounts/free stuff to repeat customers.
This entire discussion is about how resale buyers can get to that next level - direct perks. Disney isn't going to offer resale buyers a quick payment to get the blue card; it damages the loyalty program. I could even see them increasing the minimum points required to get the blue card.