I just purchased 5 great domains in my niche from godaddy auction and premier accounts. The metrics are not bad but the backlinks are all related to my niche. I did have options to purchase other domains with loads of backlinks, but almost all backlinks have nothing to do with my niche. I read countless blogs on how you should use different registers to avoid foot prints. Is this pure speculation? I plan to do private whois and find decent VPS host (different data center) for each domain. Has anyone else built a PBN using just one register without any long term issues?