RTT...20-20 hindsight.

My daughter wanted me to look into Ella Langley tickets at Wells Fargo. They went on sale at 10 and were almost sold out 10 minutes later. She must be a pretty popular artist.
The biggest problem in concert ticket sales is the presales. The secondary markets can create 1000s of fan club members to get early access to tickets.
By the time tickets go on sale to the general public they sell out in 10 minutes because there weren't that many left. Yet StubHub, Vivid Seats and the other resellers have a boatload of tickets to sell at a substantial markup at the same time.