Ticketfly is doing a good job. They do charge some fees, but not to the egregious extent of Ticketmaster, and have a much better interface that holds up against traffic.

Unfortunately, Ticketmaster has a habit of just buying/merging with competitors (including Live Nation, in a merger that should have never been allowed to go through).

Plus, Live Nation actually owns a lot of venues, so you'll never see them use another ticketing provider: https://en.wikipedia.org/wiki/Live_Nation_Entertainment#Venu...