I got Marriott credit for a $50 whatever night in O'Hare Airport mid December. This is what Starwood says "officially" about getting credit via Priceline:
priceline.com vouchers are not eligible for Starpoint credit. Human error, the generosity of an individual hotel or luck are the only reasons someone might receive points for such a stay.
http://www.flyertalk.com/forum/Forum74/HTML/001132.html
Those 3 factors cover most good breaks in life surely?
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Glen ~