Agreed... We have done both...
A few years ago we journeyed from VB to the MK for a day trip... I explained to the guard at the gate that we were staying at VB and he saw the parking pass... We got waved right through...
I also experimented with putting charges on the room key... Worked like a charm.. I went back the next day to the VB front desk and our charges from MK were itemized on our bill...