Passengers who arrive at airports via rail have always paid a surcharge for, well, being awesome, for not clogging up curb sides, for not parking in eyesores, etc. Just think of the subway to JFK airport - normally $2 per ride in Queens, it costs $7.00 to the airport. Or BART to SFO, the price spikes for the airport but dips again to Millbrae, a station further along the line. You probably know countless other examples.
Now one airport finally has the sense of fairness to charge drivers to drop off at the airport, too.