I'm not a fanime con rep, so I'm sure they can list a billion things that I don't even know about. But I'm sure part of what the money goes towards is simply renting the convention space and the hall across the street. Renting all the rooms at the con center and insuring it against theft/damage/loss is probably a part of what they spend their money towards, plus probably some type of permits in order for things like the dealer's hall to function... Plus just because the staff isn't paid doesn't necessarily mean that they aren't provided water and/or snacks, things to keep them functioning during the hours they have to be on-staff so we don't have fainting rovers all over the place. The con also provides all of the gaming equipment and such, which I imagine has been damaged more than once; they have to rent all the arcade machines, and they're liable to the company they're renting it from in case of damage... Not to mention, the big guests at these cons... Well, I don't know if they're paid, but I know people like Momoi aren't paying the airfare all on their own out of their own good will. The guests come from all over the country as well as out of it, and I'm sure the con takes care of feeding them and making sure they have a place to stay. I'm sure the list goes on and on... janitorial services... rental of video/projection/sound equipment... etc etc. Even the badges themselves cost money to produce. I think the only reason pre-reg is lower than later on is because of the convenience it offers the con. They get a general picture about how many attendees are going to be coming, and since the money is paid on the spot, they're able to use it to purchase supplies, deposits, all that stuff.