Not to say all things bad about PBN service. This morning one of my sites drop to no. 2. And, I did some researches and found out that the new no. 1 competitor is using PBN links mostly. I went to see their links and found out another resources. The PBN links have many other links to other people sites. The gem is "THOSE ARE THE NICHES WITH EASY TO COMPETE & have enough market to earn profit and niche that I just can't think of if I didn't see it with these PBN links". I'm going to have more good profitable niches to work on right now! Therefore, PBN service is just that risk, too!