After commenting, I suspect that the TicketMaster system meets the requirements of most bands. This is noted in the article for the reason you mentioned, but I think the current situation provides additional business utility to the performers.
$70 tickets don't segment the market in the same way $700 tickets do. The expected lifetime value of one $700 a ticket fan is probably much more than the expected lifetime value of a $70 a ticket fan. The $70 a ticket fan might be stretched and is less likely buy a hoodie and get drunk on craft beer and use valet parking...all of which the band gets a cut.