For me, it's about $70 for just fuel, round trip. Plus the entry fee. It's hard to justify
If the show is fading, it might be the result of their surprisingly inadequate web presentation of the show information. You have to already know about it to really tease out the essential info.
On their home page:
http://corpipesmokers.org/, there is a plain, small paragraph about it, after the windy "who we are" paragraph. It contains a nearly invisible link, followed by tedious navigation and poster resizing just to get the essentials--not even the admission fee. I'm sure that the folks who are aware of the show don't even notice the obscurity of CORPS' marketing for the event.
Bob