The $2 box office charge doesn't appear to go to Ticketmaster, their faqs say "At the Birchmere Box Office, we have a $2 service charge per ticket. This charge is for our Box Office Staff, Parking, & Security. We want you here, happy & safe!"
How lame to arbitrarily cite certain expenses of their business and tack on an extra charge for them. Consequently, when they advertise a show for $35, there's no actual way to see the show for that price