I think you're neglecting to consider the cooling effect ticketmaster has on supply by being a monopoly. If there were more independent venues, and artists were better compensated, then far more middle tier artists could support themselves full-time, likely creating more supply of top-tier performers.
Instead, ALL monopolies have an incentive to minimize supply and maximize price. So of course demand exceeds supply.
Instead, ALL monopolies have an incentive to minimize supply and maximize price. So of course demand exceeds supply.