The last thing I bought was "Sherlock Homes Hacks Google" or something like that service. It didn't really improve my ranking much. It was like 4 months ago. Now I'm wondering, what can I buy that will actually increase my ranking a lot? I'm competing for really tough keywords. I'm 8x/9x position on 2. and 5x position on other 2. With all the Google changes I don't even know what works anymore. I guess Guest Posting sucks now too right? Can someone send me links to recommended service? Thanks a lot.