I think it has already been covered in some other replies. Just to be complete, what I was suggesting is if you decide to do so and are successful making alternate accommodations, you could negotiate with the hotel to still provide some compensation. Normally if you voluntarily cancel a reservation (defined as you initiate the cancellation), you are not entitled to any compensation. So you would be negotiating that in consideration of your voluntarily cancelling your reservation in advance to help them with their overbooking, you would like compensation. You should be specific about what compensation you want, perhaps asking for the 90K points. That would still be cheaper for them then the full walk compensation (paid night in another property, $100, and 90K points).

--Jon