The problem is a lot of these things are from small businesses that expect to send out maybe 100 free items to locals who know the company.
Once the shit gets posted on [H]ot Deals or SlickDeals and thousands of people are ordering free stuff there's no way they can afford it and they just ignore most of the requests.
I got an oakley sunglasses bag and samples of food and other stuff, magazines and such.
Surprisingly I have received most free magazines and accessories such as camera strap I signed up for. Though I don't just sign up for everything as I hate junk mail piling in my mail box