And regarding the quote Fisty posted from the article "hardcore displayed on free sites was bad for sales" is Not true.
A video gallery for example I did recently featuring a Mom/Milf site had some kissing, bj action and then the last clip had an intense hard sex scene and the gallery is selling great. Why? The couple in the gallery are really going at it. Great teaser to join the paysite and see more hot action like that.
PS. Possibly, Zero hardcore available outside a paysite would be great for sales, but that is not a reality unfortuneately.