Just to let you know that I have been using this strategy for a while now (for those who dont know what Im talking about here, search on BHW). When using this SEO strategy, you CANNOT control the number of backlinks you will get. In the last week, I went from 700 BLs to 1800++ and all these BLs are from 2/3 blogs only. Guess what, Google dont like that at all. Just got penalized alot even if all of my comments were related/no spam! Beware!