I guess you don’t realize all the space DEFCon has for non going to bars to get drunk while attending. Here’s a small writeup from the FAQ
Some people play capture the flag 24x7, while many people never touch a computer at DEF CON. Some people see every speech they can, while others miss all speeches. Other activities include contests, movie marathons, scavenger hunts, sleep deprivation, lock picking, warez trading, drunken parties, spot the fed contest, the official music events.
While they don’t have a tabletop area they do have a generic hackerspace where a friend of mine spends the majority of his time at the con (when not attending zoz’s panels). Whether you want to acknowledge it or not there’s a lot to do there independent of panels, and many attendees take advantage of that.
I’m not sure how that impacts it “draw wise” but I do think it’s safe to say it’s nothing like finance con where people get the con part out of the way so they can go drink.