I've had mine published probably since the 90's - since registration got down out of the three figure range and open to everyday people.
Sure, I get lots of spam, but I can't see any connection between the contact info and any particular spam. When my registrars have stupidly assumed that they can just default to not publishing it, I haven't seen any drop off.
Remember when we started out with modems and dial-up internet? People who had their name and address published in the Phone Book would freak out because someone posted their real name (and phone number!) on the internet. I think it's a lot like that.
I know there are circumstances where it can be dangerous to publish contact info for someone responsible for a web site. I still think that it's irresponsible to let just anybody throw up a web site with no direct contact info available without jumping through hoops. What do you have to hide?
I think there are links on the web page for an address that should forward to more than one person who could respond to a problem or question, so it probably doesn't provide any advantage for KCLUG.
-- Jonathan