I've been to a few regional conferences so perhaps out of touch, but in those scenarios it's usually either yawn yawn buffet or in most cases a bag with some posh sandwich etc.. in with sponsor logos all over it. I get what you're saying but I can't help but start picturing a table cloth lunch with waiter service as you discuss the merits of the last talk over a fine wine on a table for two/three? perhaps this happens at build? strangeloop?aws:invent? How much of a ticket price is attributed to catering in either scenario?