Yes, this is a great idea. Another one to add for almost all Marriott Hotels: Room rate cutbacks!

Sydney Harbour Marriott - went from $369 AUD to $289 AUD Still have 7 days a week lounge access and complimentary drinks in the evening.

Renaissance Kowloon - went from $1885 HKD to $1035 HKD Still have 7 days a week lounge access and complimentary drinks in the evening.

Vail Marriott - while base prices ($489) haven't changed, there are advanced purchase rates available this year ranging form $299-399 that were not available previous years.

The only Marriott property I have stayed in in the past 3 months whose room rates did not go down is JW Marriott Phuket, but they still have the most fabulous breakfast buffet (American, European, Chinese, Japanese, and Thia) which is complimentary 7 days a week for Plats and Golds too I believe.