Google has updated its position on blog commenting in this post on their official webmaster blog:
Hard Facts About Comment Spam
What is clear from the post, crystal clear, is that Google is out to spot and “at best” ignore your efforts:
“Google has an understanding of the link graph of the web, and has algorithmic ways of [...]

Whilst there has been an explosion of various forms of e-billing in recent years, most of these are powered by plastic and cash still remains the preferred form of money in the eyes of most people: it’s tangible, government backed, and guaranteed to be accepted with a smile at most points of sale throughout the [...]