http://www.100bestbuy.com has implemented a very mean business idea which is not questionable as they are not stealing anything, they just ask you to give it away :D
they post contest details like get an iPhone 4S/ glaxay tab/ etc for just 499.
They say they'll return all money, not that they dont. But they do it in term of credit in your account on their site. Which means you have to buy something from their site.
so the business idea - get user to get registered for contest which they will not win but will end up pay some money
then credit equal points on site account and user now has to buy soimething on the site.
win win for http://www.100bestbuy.com no give away as contest prize, keep selling your products.
just to give an idea they sell the same product they say they will give away in contest.
there is no way to see who won the contest.