| I write computer games for a living. Everything I produce gets pirated. Data from various game releases shows that an early, or pre-release, pirate will reduce first month sales by 5-20%. Now, D&D is likely to suffer less due to the superiority of the print product but I'd still expect them to lose a non-trivial number of sales, and a non-trivial amount of money over this. Yes, there would have been scans up within hours, but the pre-release nature of these leak will be more harmful.
As for taking down torrents, and the like, yeah, you can't beat them but if you do nothing the problem gets worse and you lose more sales. | 
And yet another word from our sponsors
