The sale concerns the domains, not the sites. If you read my post carefully it says these are the portal domains of our 'Free hosting network'. We are not owner of the sites and it's content, so cannot sell this.
The platform is currently hosted on 7 servers and with this huge ammount of traffic we stopped turning statistics long time ago. The size of the logfiles made the servers go down. Alexa should be trustable enough.
The revenue was obviously big enough to have keep an network runing like this for free for over 4 years
Just make your bid and who knows. I think people who see the potentional will have an feeling about an minimum bid...