It's just GIGO
My HOST file is over 330K bytes. Literally thousands of AD servers blocked, almost 900 Facebook IP address block, Google, LinkedIn, Tweeter, Microsoft, all blocked.
I haven't seen an ad on a web page in years. Yet, when I make a request to a site (like TheReg) for the IP address of the ad servers they use I get no response back.
I can only guess that they either don't give a shit (probably so!), don't know, or are so micromanaged that the staff can't reply to my request.
If sites don't get revenue from my visits, it's not my fault. The ad industry needs to be shit canned, cleaned out, rethought, and most of all made responsible for the crap they push. Think of it like this, where do you think all the Enron employees went when it got shut down - they're managing advertising accounts now because they couldn't get a job any place else but in a sleaze bag industry like ad pumping.
FLoC'em ALL!