FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,041
I have little doubt that "off-peak" will only apply to nights that were already so cheap that you probably would have paid cash anyhow...
And since Marriott has long been so fond of "category creep" devaluations, peak pricing is simply another way of accomplishing this.