I guess there is no way Google can tell if a blog owner has been paid to write a review. The point I was trying to make is that those that like a site will link to it naturally without accepting payment. This is much better than paying for links on mass.
If so whos to say you didnt give the blog owner a tenner to write that review? Google doesnt know if you paid or not half the time which is how big firms get away with it.