5 day mail delivery will save NFLX money. Why? Because NFLX still gets $9 from their subscribers whether they ship DVDs in 5 or 6 working days. One less working day means they spend LESS in postage. Get it?
With 5 day mail delivery, subscribers are screwed.
With 5 day mail delivery, shareholders win.
If subscribers are smart, they do their DVDs check out on Wednesdays so that their DVDs arrive on Fridays.