Well I originally had a 2 night stay booked at a hotel, but I noticed that the second night's rate was $15 cheaper at a different Bonvoy brand hotel 15 minutes down the street. I normally wouldn't have bothered, especially in prior years with double nights on every paid stay, but since I now save both $15 and get an extra night for the extra brand, I shortened my stay and booked a second night there instead.

So the new promotion terms this year has succesfully netted Marriott negative $15 in marginal spend out of me.