Almost all the shows I've attended over the past few years, they expect you to sign in. I understand they want to build their contact list for prospective buyers and that's the way t works now.
Yes, the show was filled with higher priced boats, but the only used boat show I know of is Yachtworld.com available over the web...
At least you didn't see signs saying boarding with your broker, like you do in Miami and Ft. Lauderdale shows.
I wasn't going to go but found two boats I was interested in would be there so it was well worth the trip for us.