Can I avoid the $8 online service fee by buying a ticket at the Box Office before the show?

you should probably call ahead, I've been to events that were free so you might avoid service fee depending on the event.

I have avoided the convenience fees by paying at the box office, however, sometimes venues will charge you the convenience fee anyway, just because they can. I think it has gone both ways for me at Warehouse Live.

People have become lazy.. Mainly due to the devices in thier hands..