Browsing a clearnet site via tor offers the client the protection of tor, but information about the server (such as IP address, Internet service provider, physical location, maybe name of the administrator/owner via WHOIS records) is still in the public.
There are lots of grey area and also plain illegal businesses which operate from the clearnet, which is why all of this (WHOIS records) must be avoidable somehow. Anybody know how to register and run a clearnet site completely anonymously as your services will be of use?