Not necessarily. In my case I made a 5 night reservation (feb 9-14) but in the end I'm staying at a different hotel in Miami. And I reserved 3 rooms for a weekend (feb 15-17) anticipating having family join me, but in the end I'm only using one room myself so I have 2 extra. Rather than just cancel and redeposit the points I'm offering to sell the rooms if it will help someone here. But I'm not going to sell it "cheap" as I'd rather hold on to the points then.
That's not to say that others here aren't trying to book and flip, but I didn't book intending to do that.