You are forgetting the boost to the local economy. Many people will stay in a hotel. Eat out. Pay for transportation. Pay for parking.
They estimated that her USA concert tour added 1 GDT point to the US economy last summer. There were mayors of cities that were NOT part of the tour begging for her to do a show in their city.
When she played two shows in Foxborough, MA not only were the shows sold out but so was parking. So was the train tickets on the Acella those dates. All of these things got sold on the secondary market at much higher than their face value. Hotels in Boston were booked. Every hotel around the stadium was sold out.
FYI, two 40 something year old guys in my office were able to get tickets because years ago they joined the Taylor Swift fan club. Each sold the tickets they were able to get within a day of buying them for a large profit on Stub Hub.
These two same guys were formerly in the Hannah Montana fan club when she was popular with young girls. One of them used to work as a ticket broker.
“You are forgetting the boost to the local economy...”
A music show does not produce wealth, which is the only true boost to an economy, it just moves money from one pants pocket to another.