I guess I think the opposite. I have found for us that the earlier I book things the cheaper they are. For instance, the Marriott resorts are almost always a great deal cheaper if you book them as far out as possible. I recently got a rate of $145 a night at the Grande Vista for June. Then when I checked again the rate was $249 a night!
But I usually wind up booking a reservation that I can cancel without penalty. If you use Hotel Kingdom, you will have to pay something.
I think you just have to be on the lookout for deals and book when you see something you like that will give you the option to maybe cancel if something better comes along.
happy planning!
HeatherC