IMO, MB is overrated. We didn't end up doing it because we wanted the points.
The best argument I have as to why it's generally a good deal to take MB is that Disney didn't offer it in the first 3-4 of selling PIT even though they did for other resorts. They had enough buyers lined up at the opening prices and they felt they'd be worse off by offering MB for PIT at the time (even though they can probably rent out those points for a lot more than $20). They also don't offer it for the "sold out" resorts.
In fact, a salesperson tried to convince me that MB was a bad deal for the buyers (because I was looking at 100 points and was lamenting the lack of MB) by quoting a bunch of rack rates as a benchmark for what keeping the points was worth. So I suggested that if the points are worth that much, I'll still take the $20 and let DVD profit on the difference...
In the end, my goal as a buyer is to minimize the purchase cost. If I can save $20 by giving up a "fully loaded" contract for a "standard loaded" contract, I'd do it any day. In fact, I'd even give up the next 2 years of points for an extra $40 off... If they did that, you'd still get 40-45 years of usage and unrestricted points for the life of the contract for the price of resale! Giving up 2 years out of multiple decades seems like a small price to pay!
Maybe we should start a poll...
If you had the choice of Poly resale starting in 2025 or Poly from the developer (can book all current and future resorts, blue card, etc) staring in 2027
at the same price, which would you pick?
If you picked Poly direct starting in 2027, would you rather pay an extra $40/pt to get the points starting in 2025?