more than you'd like them to. There are raffles to enter (see the above comment about sharing your personal information), and swag to collect if you're interested.
Thankfully unlike events such as E3 and car shows there are no "booth babes", but there are some notable uniforms or costumes that border on inappropriate.
For the most part, though, the exposition hall is worth visiting, especially if there's a particular product or service that you're interested in checking out or talking to someone about. The vendors are all more than happy to talk about their company and how they would be a great fit in your school or school division.