Because the promoters, talent, and talent management are all in on it, TM just agrees to take the heat for its cut.
That is not to say that separating TM from the venues will not help concert goers, but maybe not as much as you might think.
I was a fly on the wall for a conversation with someone who runs a 12k seat venue. They guaranteed Harry Styles $5 million for 2 nights and made it work because.... "secondary". Even the venues are in on the scalping.
Because the promoters, talent, and talent management are all in on it, TM just agrees to take the heat for its cut.
That is not to say that separating TM from the venues will not help concert goers, but maybe not as much as you might think.