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: 13,050
Fifth night is free for elite members. This ends up working as a 20% discount on stays of 5 nights.
However, pricing for 5+ nights does get quirky, instead of charging that 6th night at the full point cost per night, some sort of weird averaging goes on that makes it a bit cheaper than it should be.