Startup idea: allow people to share their conference badges during unused days (or during any non-use times). I often can't stay an entire conference, and usually ditch my badge. For a sold out show, would be nice to hand it to someone else. "The AirBnB of Conference Badges"
I'm sure this goes against the badge policies, however.
I don't know when the person you replied to last went, but I went to every WWDC since 2007 and the sessions have only gotten more and more packed and lab time for some popular topics even harder to come across. Granted there's always unpopular/niche sessions with half empty rooms, but I also went to sessions that were so packed all the available floor space that wasn't a fire hazard was occupied.
I understand the grumbling at the idiots that buy a $1600 ticket to watch the keynote, but I don't think there's that many people that truly impulse buy such a thing just to see the damn keynote. I've skipped out on half the keynotes so far to sleep in and eat breakfast and show up in time for the SOTUs in the afternoon instead, which are much more informational.
This is almost universally against convention rules. If it became popular, the conference organizers would just start making good on their threats and you'd see your name cursed across the Internet for getting your users' badges taken away.
Yeah this is something that happens a lot at WWDC. Every year Apple threatens to check IDs at the door, but they never do that I have seen besides at registration.
I'm sure this goes against the badge policies, however.