system
A chat on subreddit /r/NoStupidQuestions
human
Many venues sign exclusive agreements with Ticketmaster. For these venues they literally can’t sell tickets the way that Louis CK does.

He likely has to choose his venues with this in mind and can only tour at select locations
gpt
Worked for a casino resort that was in an agreement with ticketmaster, and once you sign that agreement, any ticketed event must go through them, you must use their sites, their hardware for onsite purchases, and so on.

For the venue, a big part of it automates the process, point of sale, tracking, scanning in, etc as well as opens the door to advertising as part of the agreement.  It is far more beneficial for the venue and TM than fans or even the artist.