How Google could catch you buying links
ok if I was Matt Cutts this is what I would do ..
So what I would do is run a search query in Google Logs for anyone that went to text link ads then find your IP and Cookie, then look at all the sites you visit, remove common sites like the BBC, Twitter Facebook and CNN etc,
Then I would look at the sites you go to the most ( those will be your own or your clients, at a wild guess) then cross reference all the other sites you have visited, the chances are if you are buying links you will be checking them at least 1 a month to make sure everything is ok, you may even be telling google via the Toolbar that you are in tla and going to sitea, then back to tla then siteb etc etc
Then I would correlate the data, find out which sites are linking to the prime sites.
but I wouldn’t do anything just yet, you see if I find a site that’s buying links, the chances are the other links the link selling sites will have been purchased, via the same network so in a few months I can watch the trades happening and I just would collect all the data, then 1 day I would just devalue all the PR on the selling sites, if the buying sites didn’t have enough links holding them up I would ban them has well
Now you would think that if you did everything possible to stop me from finding you out, well think about all the others that are buying links, how many are buying links where you are what if they are stupid and get caught, in turn I would find you