Well first of all, what is your evidence that these "pieces of shit are stealing your content". The fact that you aren't financially making what you would like from your sites isn't evidence because, as I already stated, lack of sales is more likely do to a lack of interest in your product.
Secondly, someone stealing your content, and someone file-sharing your content are two different issues. Assuming you could actually prove someone stold your content and then shared it, unless they did it for some sort of obvious commercial enterprise, you would then have to prove that the individuals'
noncommercial copying resulted in provable actual harm to you as the copyright holder. Hence the point I made earlier which is that just because someone watches something for free isn't proof that they'd pay for it if they couldn't get it for free. So you can't compute damages theoretically based on the number of downloads for a particular file, number of views, etc., because there is no proof that those individulas would have ever payed for your product otherwise.
And lastly, No,
noncommercial file sharing should not constitute an actionable copyright infringement.
Sony BMG Music Entertainment et al. v. Tenenbaum;
http://sunsteinlaw.com/judge-urges-...when-might-sharing-digital-music-be-fair-use/. This type of behavior falls under the Fair Use Doctrine (Sec. 107 of the Copyright Act)
http://fairuse.stanford.edu/Copyright_and_Fair_Use_Overview/chapter9/9-b.html, and thus should be exempt from the DCMA. Examples of similar noncommercial fair usages would be 1) using an audio, video casette or CD recorder to make mixtapes/video recordings and sharing them with others, or 2) using copyrighted music in your cooking videos or Porn Star Vacation videos and putting them on Youtube without paying royalties to the copyright owner (borderline).
Sony Corp. of America v. Universal City Studios, Inc., 464 U.S. 417 (1984), http://en.wikipedia.org/wiki/Sony_Corp._of_America_v._Universal_City_Studios,_Inc.