To be fair, $15 on a $75 ticket seems pretty standard these days, whether Ticketmaster or some other vendor. It's always worth exploring the option to buy directly at the box office, as you can often bypass many of the associated fees.
Yeah 15 isn't bad, but even at that cost I would expect to get a physical ticket or some kind of memento. Ship me something. An empty bag with my name on it IDGAF.