With respect, I think this is a really bad idea. Black Hat taking on Black Hat so to speak. These scraper sites do get dropped by the search engines, normally after a few days, but some do take a few weeks maybe a bit longer.
Our time and effort and thus money should be spent on updating our sites, ensuring quality content. This in the long run beats Black Hat SEO tactics hands down and gets the desired results.
If you are really annoyed about some of these scraper black hat sites, then just report them to google. It works as well. Then they will be gone even quicker from the index.