You can't disrupt Ticketmaster's service fees because it's the venues and the peformers that are also profiting from those service fees.

Apparently, Ticketmaster's business model is based on taking the negative public relations hit for charging higher prices on behalf of their customers.

If you create a startup called CheaperTickets.com with the noble intention of not charging those hated service fees, you won't get any customers. (Keep in mind it's the venues & the artists that are the real customers of Ticketmaster and not the ticket buyers). The venues want the lucrative cut of the service fees while Ticketmaster gladly takes the heat.

[1]http://www.laweekly.com/music/ticketmaster-and-servants-band...

[2]http://www.reddit.com/r/todayilearned/comments/1xlt0i/til_ti...