I've noticed that when I search for MegaCon photos online, there's so much you don't see. Maybe a site has few dozen photos, usually of the most impressive cosplay or of a huge crowd, but it's just the tiniest of what's there.
I've also noticed that viewing these kinds of photos tends to be a lot better as a group experience. View it on a big screen TV with appropiately nerdy friends, and you'll find yourself commenting on the surprises or the quality, or the hot guys/girls, etc. Or somebody will ask where a cosplay came from, and another friend will have the answer. It's actually pretty fun. Alone, people just tend to wonder when it ends before getting bored and closing it after getting the idea.
Thursday, the photos tend to be more candid, but the traditional poses dominate the every other day.