If I took DVD's and copied movies, then sold those movies for less than each DVD cost, I'd still be considered in violation of a copyright. Why? Because I am undercutting the cost of the DVD, and now the manufacturer (creator) of the DVD doesn't get paid.
If you can not profit from content you get for free while charging $300 for people to sit and watch it, you have no business orchestrating this anyway.
From the altconf website: "Hero ticket holders get guaranteed entry to speaker sessions, but not the WWDC viewing theatre."
They aren't selling $300 tickets to watch WWDC on a projector, the $300 is to get seats to listen to their own speakers.