I certainly wouldn't discourage anyone from doing whatever they can to protect their work. I won't say it's a losing battle either, but as derrys1969 says, there are certain realities that have to be faced. I reported such a site to Daz some years ago and AFAIK, it was taken down. Since then, the number or graphics download sites and torrents has increased tremendously.  Simply put, 3D has become popular enough to attract piracy. MPAA and RIAA have legions of lawyers and political clout. They've sued a lot of people and won a lot of judgments, but you can still find first run movies and music without paying for it.

They could include some kind of elaborate DRM in Poser/DS and that would work for about a week at most before someone cracked it. In the end, you will probably spend more time and perhaps money trying to quash warez than you would recoup in sales. At best, the numbers are unknown. If you want some emotional satisfaction, upload some dummy files to these sites. At least you'll know that downloaders will be frustrated - until someone posts the real item - though some may be wary of getting burned twice and perhaps you'll have a small net reduction. Oh, and of course, you'll probably be banned for posting fakes.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken