agree with pp.
Time : turn around from offer to being able to book (longer if ROFR) is about 60 days.
There are a small amount of things you currently cannot book with resale points, this could always grow. Depending on if Disney wants to have a bigger selling feature on the direct points. You will be always allowed to book your home resort, and IMO always other resorts at a slightly closer to date (maybe 11-7 month changes, but still something). But anything else can change.
It also is difficult to finance resale contracts. Your options are cash or using your own credit IE a credit card (you take cash out of), HELOC, installment loan from bank (usually not secured so HIGH interest) ect
All things being = it saves you some where between 60 and 100$ per point and I could not imagine paying 160$ a point new, when resale is 90$ at the highest (est of BLT) and 50ish at the lowest (est VB).