I don't think it effects the airport but they definitely add $10 to the departing ferry fee. It was increased from $4.85 to $10 and added to the ticket price in March 2014. You may have just thought the ferry was just squeezing out more but it was a tax increase.

Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. - Mark Twain