As long as they only lose one sale for every 2 that they keep, they are still making more money. Actually, I assume the 15 goes to the venue, so if they charge $12 in fees instead of $3 in fees, they are making 400% more profilt.

The ones that may be losing out are the venues. But if they dumped Ticketmaster, they'd have to rely on box office sales.

Please don't take this as defending them. Considering Ticketmaster does little more than run a database and a website, I don't know how they explain their fees except to say they can get away with it. They don't even advertise the shows.