Ko Olina points analysis
Marriott would offer 4050 points for a 2BR mountainview unit in their newly defined low season. So, 100% equivalency if you settle for one of those 27 weeks.
However, Ko Olina weeks were marketed as 50-week platinum. So, 23 weeks have now been removed from availability for those 4050 points. Now they cost from 4575 points (12.9% premium) to 4800 (18.5% premium). Other exposures are a good deal worse (17.7% to 23.9% for a top of the line 3BR oceanfront unit). This, of course, ignores the lockoff equivalencies, discussed elsewhere. They are even worse. Even low season starts at a 12.3% haircut.
I would say Marriott is exacting a very stiff price for the convenience they tout in a points exchange.