I think the point is, you start at the maximum price you think any significant number of people will pay. If that's $4000, it's $4000.
Of course if the biggest venue isn't big enough to do that, then that's more of a problem of the local facilities, or the artist's decision to play in an area with inadequately sized venues.
A Ferrari dealership has to turn away the vast majority of folks who want to test drive their cars, a B&B, or boutique hotel has to turn away customers, or price rooms very highly, on a busy weekend, etc.
They are still very popular regardless.