As a precaution, try not to link your money site to so called low OBL blogs because if you can discover/scrape them, some random spammer can as well. You can use all these blogs as the base level for your pyramid.
Make sure that you personally control all the links to your money site to ensure high quality, or at least get some quality links, like from manual d0f0l0 blogs.
I'm finding alot of really good PR places where I can comment but I never used blog commenting is it worth? If good PR and all most no OBL? pr5,4?