I can't understand the basics of why parasiting is good for BH SEO purposes. Basically you open a subsite on a high DA but starting with 1 PA can last forever. For instance: If for example lets say Youtube is the best parasiting site, why not opening 200 pages in youtube? I suppose the GSE algorithm considers that more different domains linking, better positioning. I've been trying to start with youtube video, and what I see after 2 months, is that PA is stucked in 1 (while other domains I've bought can get PA 10 in 2 months easily). Same happens with a sub-blog inside a blog network of a magazine: PA 1 after 3 months (DA of the magazine:70) But for example, I created a blog in a low DA site domain (30), and an article I wrote 1 month ago, already achieved 5 PA. Eventually, PA and DA are not the sole metrics that explain how the GSE alg is going to rank, but I find that maybe focusing efforts on parasitism is less worthy that spending the same time on our own PBN.