Has no one even read the summary?
This company provides bags to lock your cellphone in, and carry it around yourself until exiting at the end of the show, when it will be unlocked.
This is not a big deal in Chappelle's show, where you go to a seat, sit down and put the bag on your lap until the performance is done. It is a big deal for Chappelle himself, because if your brother goes to the show, records the performance, then plays it for your extended family at Thanksgiving, Chappelle just lost the possibility of 3-10(?) ticket sales. As opposed to you going to dinner, raving about how hilarious the show was, and 3-10(?) people deciding to buy tickets.
Concealing cameras? Make people walk through a metal detector on the way in.
Do you think you have some entitlement to carry your camera into the show? They can put a condition on the ticket. It's not your right to do anything when attending a private show that has informed you of the conditions to enter. Resell a ticket - it's called scalping, not a right because you have to work late. If you don't want to follow the rules of the show, you're not allowed in. Chances are there's already a clause that says they can eject you for any reason at any time during the show. Not to mention you're already on private property, so get kicked out and see if a court will refund you your $50.
It has nothing to do with copyright, will probably not spread to the shows of musical performers, and I thought it was a great idea when I heard it, perfectly enforceable and intelligent. You keep your phone in a reasonably durable bag, and pay $300 damages if you don't return an intact bag at the end of the show.