After buying couple of dozens SEO and Link Building Services from BST section over one and half years I can say that many Guys there provide Hit and Run/Abandon type services . This happens specially with Blog posts on private network type service providers. I can understand that we do not buy specific Rank as no one can guarantee that but at least links can be in case of blog posts . I have experienced blog posts which goes down just after 2 weeks . Some guys try to resell other's network whose domains are about to expire in some weeks . bought one service whose domain got expired just after 2 weeks and seller disappeared ! It takes around 2 to 4 weeks to start seeing effect of a link building campaign and if links goes down just after some weeks then it is complete RIP off . Some guys keep running and offering links on their same network in same thread by adding new domains but letting old domains gets expired . These things need to added in Norms for approving BST in link building section specially for Blog posts service : 1. Links should stay on healthy sites ( not deindexed by google ) for at least some fix amount of time (should be at least 6 months ) . If site got deindexed before that fixed time or domain expired then seller should replace link using other healthy sites or add new site in network to do this . 2. In case of this replacement , seller should send notification regarding this or send fresh report . 3. If some guy is offering 2 PBN service , everything should be different for both PBNs . Like IPs , whois etc. Means not more than one network should be hosted on same IP range and MODs should ask for this and verify. Other Buyer's experience and suggestions are welcome .