I was just playing around with booking the flight out of SFO when I tried to do it from a different browser, from which I was not logged in.

The fare that was $806.50 (Fare Basis WXPRO11) was now $775.01 and was booked in S class (SXPI01).

I find it interesting that, but not surprising, that they would seem to be trying to foist the higher fares on MP members.