I noticed with horror that the "Downtown DutyFree" ambush retail outlet at SYD T1 is now charging 2% surcharge for AX and DC cards. MC and CV are not surcharged. I do feel for the check-out staff when they point out the surcharge and get filthy looks from passengers.
Yet another nail in the coffins of AX and DC as the world's most unaccepted cards (Thanks Mr Candy Thief for that reference

).