I tried this years ago when I had a paysite. I had a massive collection of DVDs and decided that I would give them away to a member each month, all they had to do was 'enter' into a random drawing. for several months no one enetered for the drawing and then one month one person did... we sent them a few DVDs
I think a lot of people do not want to receive porn (even in plain brown wrapping) to appear at their house