Doing this is absurd, selling your identity documents for such a meager amount of money would do you know good people. Have some dignity, work and you will be paid to have a very comfortable living.
A lot of people here are living in extreme poverty so they don't have much to lose by selling their personal information. ten dollars can go a long way in countries such as Venezuela and Indonesia.
If someone can afford broadband internet and smartphone then I would not say that that particular individual is living in "extreme" poverty. And take my word. No matter how poor someone is, he is not going to give you the scanned copy of his passport for just $10. Even stolen passports can cost upwards of $1,000 on various dark markets.