I don't think the amount being asked for is unreasonable, considering the speakers, the beer and pizza, and I agree with why it was introduced, but is the new system still filing up the venue in the end? Before the sign-up fee, a week before a meetup, it wouldn't be uncommon to see most/all of the 4-500 slots already filled up.
Sanderson is hilarious though. A great addition! Something to look forward to, since sometimes some of the talks can get a little... less interesting.