That site the OP linked to does look pretty cheezy, but in all fairness, that list of "blacklisted sites" Monster publishes on its site is just as cheezy. It's ridiculously all-encompassing. It basically includes any retailer of anything electronic who's not an "authorized" Monster dealer. Some of them are just affiliate sites that link to one of their own authorized dealers!! Plus, they have entire venues listed, like Buy.com, ebay, craigslist, bizrate and next (both of which are not even retailers). So Sears and Buy.com are selling counterfeits? I somehow doubt that. If I was Sears, I'd demand evidence or else I'd sue them for libel. Good Lord! They even have facebook listed as a blacklisted dealer!!!
For warranty issues, such a list may be useful, but they could have accomplished the same thing with the list of authorized dealers without smearing hundreds of other e-tailers. There's no way in the world that they have documented evidence of counterfeit monster merchandise being sold on all of those sites. Furthermore, many of those same e-tailers probably sell on Amazon as well, yet Amazon is listed as an authorized dealer.
I forgot to check if this site is listed. I wouldn't be surprised. If there are so many dealers of fake Monster stuff, I'm sure some of it has turned up on the classifieds here.
I'm as anti-fake as the next guy, but that list looks to me like just another typical stupid, greedy Monster marketing gimmick, hence their inclusion of entire sites like ebay in lieu of listing specific sellers that happen to sell through ebay. They'd rather you didn't buy used units. Better to buy their refurbs or, better yet, new ones.