Originally Posted by
Saint4805
I think very few, if any, do this and it's been a great way to climb the status ladder when using up points at lower category hotels. Even airlines don't do this when it comes to reward flights.
Marriott does give redemption stay credits now :
Redemption Stay Credit
Even when you stay using points, it counts. Beginning November 1, 2015, we’ll provide your account Elite nights credit when you use points for stays. So you can save your cash, boost your status, and get more Rewards as a Silver, Gold or Platinum Elite member.