Tesla already has better margins on EV sales than any other automaker. If Tesla price their cars at a level that forces everyone else to lose money on EVs, it makes everyone else's transition from ICE to EV that much harder.
The much-lauded ID.3 (which is a bet-the-company project for VW) was supposed to undercut the Model 3, but the price has been slowly creeping up (and VW has had to massively de-content the base model to hit their price targets). If Tesla forces VW to take a loss on every ID.3, VAG's shares are going to start looking over-valued pretty quickly.
* It's tricky to message right. Most theaters do some dynamic pricing, with discounts for certain hours or certain days, but stronger or more complicated schemes inevitably start to come across as "we're taking more money out of your wallet just because we know you'll let us".
* Charging too high of a price can shift your market segment. Most movie theaters sell themselves as entertainment for the average Joe, and having special events with $50 tickets really undercuts that.
The canonical example is snow shovels after a blizzard.