Internet charges at Expos

Has anyone paid for internet whether wired or wireless at an expo before? How much was your charge?
I'm going to be at the Erotic Expo on June 23-25. From the price sheet that they sent me it looks like they (Smart City out of Las Vegas) are charging:
$1150 for shared ethernet service
$950 for shared etherNAT service
$754 for basic EtherNAT

Sorry hit the wrong key.
$550 for shared wireless

Am I crazy or is that way too expensive. I mean the booth was less than 1K. How in the hell can they charge that for internet?
Any advise?