And one of the secrets that SEOs have used for years is to place a link to your home page of your site on your home page of your site (using your favorite keyword in the anchor text).
I am sorry to hear that search engines like this. As a user I hate it. "Uh... isn't this the page I was already on?"
Matter of fact I've only recently added a fistful of php so that shared navigation menus won't include active links to the page you're currently on. "Top of page", yes. "Go around in a circle", no. If your user is on dialup or satellite does their browser have to make a whole new request?