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It may not affect it, but I would recommend against it. If there are "too many" black hat sites sharing the hosting then it could look like the sites are being hosted by a poor quality SEO host. I'm pretty sure Google pays attention to SEO hosts and if they are providing shared hosting for a lot...

Agreed. It's all about data driven results. If anyone makes claims without any real data to back it up then they're probably just making it up.

Personally I think using a PBN is it a bit problematic, because if one of your sites starts to accrue any type of SEO erosion then it'll pass on to the rest. I keep my sites independent from each other so if one of them starts dropping I can just replace it with a different site that has better...

We (my company - undisclosed) use our target metrics - mostly domains with CF20/TF20 and sometimes a high PR, though less so lately. We buy in bulk so that way we can pick out the ones that don't perform as well.