You're not kidding! Marriott Miles is a great way to add miles to a frequent flyer account especially if you're willing to switch hotels multiple times during a week. Last year when they ran the double take bonus promo I was able to add 100,000 miles to my United account in about 6 months by staying at Marriott on Sundays, Tuesdays, and Thursdays and elsewhere on Mondays and Wednesdays. The promo has ended but the regular 2500 bonus miles after 5 stays is still pretty good.