Buying links is unnatural
Buying links as an SEO tactic aimed at getting high ranking links back to your site has never been a good idea. Again, simply remember this – create lots of great content and work hard at networking to natually acquire links back to your content and you will be just fine.
Google hinted in this post that they are going to start weeding out links that are unnatural with penalties for both buyers and sellers.
“If, however, a webmaster chooses to buy or sell links for the purpose of manipulating search engine rankings, we reserve the right to protect the quality of our index.”