whay do people still fall for the same old scams

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There are tons of sites that promise 100$ per click, mail, signup bonus, etc. When you think about it, it is crystal clear that these sites are scam. First of all, most of the times their advertising prices are a lot lower than what they pay the members. Second, no advertiser can afford that amount of money for a nearly non-effective advertising campaign. But still tons of people get tricked into joining these sites and end up wasting their time and money. Why do you think this is? Is it because people are hoping that some of this sites will make their day and pay them that extraordinary amount of money for so little work? Or is it because they are not informed enough on the trickiness of mmo? Or is it something else? What are your thoughts and/or experiences?