"warning if your site is there just to pass traffic on to another site Y! will catch you and demote you, sad but true for the affiliate guys "
you mean, if you have a domain name with 6 dashes, five pages and 200 affiliate links :)? I think they evaluate if the site is off any use to the average Joe. Can they do this for all these sites though? People will just keep changing domains every 6 months.