I have not seen a report of Grandview using it, and many are given away or sold for just a few bucks.
While there is nothing wrong with ROFR I think its biggest impact is psychological for potential timeshare owners who don't really know the true values of timeshares:
For example, ROFR can:
-- Scare a potential buyer into buying points from the developer for thousands more over "fear of missing out."
-- A tool for a salesperson to tell a potential buyer that the resort has "right of first refusal" on sales of units by other owners, so you don't want to miss out. Buy from the developer!
For some people, the slightest hint of uncertainty in any transaction is enough to push them into making what could be a poor financial decision.
The only timeshare chain I know where ROFR has been a concern is DVC, but that is a system unlike 99.9% of the timeshare world.