enigma1 - 8:34 pm on May 3, 2011 (gmt 0)
I don't understand how you can tell someone is paying for links
You cannot tell. You just assume, unless the buyer sends a copy of the invoice to google - highly unlikely.
Besides back links setup can be so distributed that you cannot tell what's going on.
I am guessing what we see today is nothing comparing to what will happen in few years with IPV6. Domains will be a dime a dozen so I expect even lower quality search results. Right now the model google exposes forces many webmasters to go towards black hat SEO techniques.