Then perform smaller venues and ration tickets to your most-devoted fans. Unfortunately, if you do that, it's tough to become a billionaire. (Analogy: wineries. On the 4 x 4 of size and price point, you have wines positioned in each quadrant.)
TicketMaster is, or more accurately its exclusivity requirements are, the root of the problem. But everyone around them--from the municipalities that publicly finance and permit exclusivity deals by these stadiums to the artists who perform at them--are profiting from and complicit in the market failure. (Ethically, not legally.)