> These days, they have fees that can easily exceed $20 per ticket
As an anecdote, I attempted to find the most expensive ticket for an extremely popular concert near my city later this year. Ticketmaster required me to create an account (or log in) before showing me the final price (which includes service fees).
The two tickets were $2,556 each, and the service fees were an additional $383.40, each! I also looked at purchasing the cheapest ticket, for $61. The $9.15 service fee works out to exactly 15% of the price of the ticket.