Hello after lots of studying, I think have got a good idea of what I need to do to create my own private blog network. Now I am just trying to get an idea of how many domains I will need so I can calculate the expenses. I am trying to rank a competitive keyword, it's related to law and lawyers, the top sites are PR4 and PR5 Let's say I buy domains of PR4 for my network. how many of them do I need? 20? 40? 100? 200? and will the network alone rank me? or will I still need some blog comments and some gsa ser and some of the other stuff?