This is "prime real estate" now as far as fetish community exploitation. For easy money you can guy the large stuffed plushies at Toys R Us for ~$25 bucks, then you just need an hour or two worth of sewing a "strategically placed hole" (look it up on ED) and ~viola~, you've got something you can sell for like 400% profits on eBay!
This works with other communities too, like the furry community, and the plushie fawker community in general.
I hate these plushies personally. A slight disgrace to the fandom. But even then...you cant claim the idea as your own. there is no law that will protect a plushie sex doll. Unless they down right stole a (c)'ed pattern you made nothing you can do about it D: