I'm reasonably sure (via my corporate TA) that we don't get zapped for a non-Sat night stay flight. We also get flexible conditions for non flexible prices, and seat selection for non-status passengers.

Makes me question the arguement that the policy is designed to maximise revenue from business bookings. I think we do push a bit of business BAs way though. We chartered a 4class 747 in July for a week - I guess that wasn't cheap.