PBN, geez, PBN denotes "a group of sites I own." Stop saying PBN. Since 2011 I have bought dozens of sites to rank other sites. Actually, regularly when someone says PBN they are probably doing it wrong. Tier, geez, anytime I am looking through a service thread I click back as soon as I see tier 1 or tier 2. I mean, I normally click back anyway because I don't buy service threads because I have my own sites that I use to rank (see above) and I don't want any spammy stuff. Correctly made sites have tier 1 and 2 links already. Stop building them.