How do you make the most out of virtual career fairs?

How do you make the most of out virtual career fairs? I've been to two virtual career fairs and both were a waste of my time. There were 1-3 recruiters and way too many people who wanted their attention. The only thing to do at the virtual career fair, it seems, was to wait around in the chat room hoping someone might respond to your message. The recruiters seemed to indicate that they were really busy and would get to you when they got to you. Do you find virtual career fairs helpful? In what way - learning more about companies, chatting with recruiters, getting your foot in the door, chatting with other prospective candidates, etc.