Re: I've seen this before
"The easiest way to discourage visits to abusive sites is to force them into deploying abusive countermeasures. "
They already do. Some sites, newspaper sites in particular but media sites in general, call many 3rd party scripts, many of which call on scripts from even more domains so the page takes ages to load with many, many DNS queries. That's not only abusive in my book, but probably one of the reasons so many people complain about "slow" broadband.