What's so hard about selling tickets? Is it a technical challenge? A sales challenge? An operational challenge? I'm having a hard time understanding how selling tickets to a concert is so hard.
You have complex business rules. How venues are laid out change. How tickets are marketed is very dynamic.
Bad actors have a strong incentive for fraud.
You have an insane delta between median traffic & traffic spikes. You need to be able to sell out the staple center in under 4 minutes to an audience of millions.