Jersey's ranked 3rd on yahoo's listing of top 10 most counterfeited products in America. The statement specifically mentions jerseys in its description.
http://finance.yahoo.com/news/the-10-most-counterfeited-products-in-america-180942491.html?page=2
Really unfortunate. When it comes down to it most people would rather pay $20 than have something that is truly authentic. At some point it will be extremely difficult to purchase any jersey online and buying with confidence will be a thing of the past. :/