I won't speak on behalf of the Bomber crew but I'll put my own 2 cents in about this...
"Yeah, you can certainly demo all the boards you want but keep in mind that a demo isn't meant to be an all day event. With that in mind, I believe 45 minutes to an hour is more than enough to determine what you like or dislike about a board.... DEMO OVER, BRING THE DAMN BOARD BACK!!"
There, I've said it and feel much better now. So, having said that, I'd suggest bringing your 'go to' carver and taking the occasional spin on the great demo fleet that Bomber organizes with help from the event sponsors. The other choice is don't bring your carver and have to swap boards every hour.