If I'm 99+ percent sure I won't cancel and don't have a reason (like a conference) to be in a specific one, I'll check the Web for the best I can do with my assorted discounts. Then I'll Priceline for something sufficiently lower than that to make up for the loss of points and the very remote possibility of having to eat the cost if I do cancel. If I get it, I win; if not, I've only lost a couple of minutes.