Here’s how you Spoof a Google Page Rank:

1. Buy a domain.
2. 301 Redirect the domain either in you .htaccess, PHP header (anything server side) to a page with the desired page rank. It’s better to redirect to something relevant. For example, if you are doing a mortgage site, redirect to a mortgage site.
for php the code is:

header(”HTTP/1.1 301 Moved Permanently”);
header(”location:http : / / www. domain target .com”);
exit;
?>

3. Link to the page with the redirect from another of your sites that gets regularly spidered by Google. Since you use the Alexa Toolbar, you should have several sites that are spidered daily by google.

4. Wait for google update. Google Updates happen about every three months. The last update occured the week of dec 31th, 2009.

5. Now you use cloaking software that says:

if(ip is in list) (list of google IPs){
header(”HTTP/1.1 301 Moved Permanently”);
header(”location:http: / / w w w . domain target .com”);
exit;}
else
{
header(’Content-Type: text/html; charset=ISO-8859-1′);
//Show your site
};
?>

The main drawback is that your site will not actually be indexed by Google as long as you are redirecting the Googlebots to your competitors site, so it’s really only good for link selling / trading.

BTW, don’t claim to have a certain PR when you are selling - that’s fraud.