And that doesn't even begin to factor in the value you can get out of hotel stays with fifth night free, for example. (onemileatatime.boardingarea.com)
By fifth night, we slept through the night till she's hungry in the morning around 5 - 6 am. (babycenter.com)
Also, did you know that when you stay at any Marriott for four award nights in a row, you get a bonus fifth night free? (cardsfortravel.com)