Do not support bootleggers. If you are interested in porn then go buy it. Just as you should support you musical artist. Stealing other peoples work is not cool. Its also puts many artist out of business and models, singers, and etc out of work.
Also these bootlegs are of poor quality and do not have alot of the bonus and hidden material. Also many of these sellers never even ship the material. You also expose yourself to other things like identity theft when you are dealing with such people.
You support business when you spend your money and buy the real product.