Bandit650:
The only reason they have given is that they want to encourage GA (honestly). The rate per tonne is actually slightly less than last year. No based aircraft paid that as they bought landings in bulk (although no refunds if you didn't use them)
IO540
We have a seperate entrance to airside through our hangar (for which we pay, a lot ). Visitors, and I presume anyone without arrangements through a FBO or Flying school will have to go through normal security (in fact I believe visitors now have to do this to pay their landing fee in the terminal, even if just refueling)