Those hacker spaces only get a limited contingent too, and the hacker space will expect you to help set up their assembly if you get the ticket through them.
I can't help but read your "will expect you to help" part as trying to say something negative. But if they helped you get a ticket, helping them for an hour or two to setup their space feels like the least you could do.
Yes, limited contingent, but that's also expected with a limited number of seats at the congress. I'm part of two hacker spaces and none of them expected any help with setting up their assembly.