What happened is someone screwed up and gave out way too many tickets.
Not sure how you know this unless you were in the room where the tickets were being distributed, I was. The volunteer coordinator had a very detailed list of everybody who volunteered, and for how many hours, and what they were supposed to be rewarded with in return whether it was conference passes or raffle tickets. I'm not saying it's impossible that mistakes were made, but nobody was just handing out stacks of tickets willy nilly.