I would say this method works decently, however, if you continue getting 4-5-6 more links from the same site/blog, then the effects of the link will likely have diminishing effects (in fact, if you start getting a huge amount of links from the same domain, then you might be making it easier for Google to determine you are manipulating the system)

Effectively, if all things are equally and all sites/blogs had the same power and relevance, then getting 5 backlinks from different blogs would be better than getting 5 backlinks from one blog.