Wow. Uh, anon, con-goers are paying to be there, so yes, they get what they pay for, and they pay for the privilege of seeing exclusive content. Basic economics. And as for non-SPN fans, who cares? The other panels they’re waiting for have exclusive content as well. It’s the same principle as paying for a movie ticket—movie theater staff don’t want you recording the film and sharing bootleg content online, because then who else is going to buy the movie ticket to pay for the movie? It is perfectly fair, because the con-goers are paying for goods and services.
You (and I) can wait a few months for the full gag reel, anon. Stop whining. No one owes you anything.