The logo of a Web site is not only important for branding but also as a navigational element, that many users expect to link to the home page. According to usability guru Jakob Nielsen the first of Ten Good Deeds in Web Design you can do is link your logo to the home page except you are on the home page.
Mr. Nielsen conducted many usability studies and has written groundbreaking articles and books on Web usability. Good reason for me to trust him when it comes to this topic, especially when it sounds completely plausible.