It does not appear Marriott has exclusive control over their residences. I checked a few areas I rent using VRBO, Airbnb, etc. and see the same properties. Marriott also seems to price on the high side. One residence I compared across the three platforms for same dates was $6,942 with VRBO, $7,715 with Airbnb, and $8,386 on Marriott. So there doesn't seem to be anything compelling here for me on initial glance.