Bonus Points, Upgrades, Discounts or anything else. The exclusive, targeted and custom offers are available in your account.
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Marriott runs a lot of targeted, exclusive and custom offers. These are generally sent via email as well. You can check the offers available to you on the promotion central page.
These offers range from bonus points for stays to upgrades to discounts. Bonus points on multiple stays being the most common one. Unfortunately, since these are targeted, you need to check your promotions central page from time to time to keep an eye on any exclusive offer for you.