As a reference, operating costs for the VC-25 aircraft (747) that serve as Air Force One are pegged at $175,000 per hour. I assume the 747 tanker could perform multiple sorties a day, so by government standards, it’s almost a bargain.
I recall seeing a third of that, $60K. Maybe that's what the POTUS is charged when "not for gub'mint business", aka exclusively fundraising with no excuse to fly somewhere?