Thanks for your suggestion. Unfortunately, some site managers really don't want to be contacted! One cannot force a person who does not want to be contacted, to receive messages by others. But the fact that some sites are private doesn't necessarily mean that thir owners don't wish to be contacted. Please help us by specifying in more detail how you searched for BOULTS family members (since there are many ways of doing that) and post here a URL of such a search, from which you were unable to contact the various people you wanted to contact. We will analyze that and check whether we can make some improvements to help you.
If you used the Genealogy Center to do your search, note that you can sort your matches not only by individual but also by site, by clicking the Sites link in the sort line of the results. There you have 'Contact Site Manager' links that you can use even for private sites.
In any case, I'm waiting for more info from you on how you conducted your search and I promise to retrace the search you did and see how we can help you get in touch with the Site Managers if that functionality is not available today.
But suggestion still stands as a suggestion, with a specific suggestion below.
It would be an unusual researcher, surely, who publishes his stuff on the web, but then doesn't anyone else to even contact him about it. Indeed, does it not go against the sharing principle under which you provide the service ?
I suggest that the Private sites should have a default of - searchable, contactable. And that a person has to specifically override that. And that if they are not contactable, their data may as well not be searchable, giving only false hope !