(Follow-up) It's kinda exhausting reading here through comment after comment of armchair "entertainment venue economists" imagining how to maximize the profits for a single event, all the while forgetting the circumstances leading to event tickets being underpriced.
Circumstances such as the fact events are generally a part of tours, that the artists likely want a diverse audience, that event sales have side effects on future sales and marketing, etc etc.
Not specifically targeted at you, krn, but is it really so far-fetched to think that artists did think about the fact they'd still have sold out venues at a higher price point?