I just felt the need to chime in here for all of those who posted a "You should have known better" or a "I would never do that" thread.
There are thousands of people who sell their used electronics on sites like craigs list and kajiji etc. I for one shopped pretty hard on kajiji looking for a second hand iphone 5S for my mom. I decided not to buy that way because it was for my mom and the comfort of Applecare was worth the price of 200.00 more for her. I can also afford to buy it outright unlike some others.
I have even sold older mobile devices via this method. There are also lots of people who buy brand new phones on release day and sell them via these websites to places where they know there is high demand and low supply. So there is just as much more of a likelihood of getting the genuine article than getting scammed. Now I know that usually when they do this they sell the device at same cost or even a bit more and this should be a tip.
But putting posts up condemning the OP because he made a different choice that you did, is not helpful. It serves no purpose. I think in circumstances when someone is putting out some information to help the community that people should step off of their pedestal and just appreciate the post silently knowing that while YOU may be lucky/smart/whatever enough to have dodged that bullet that there are others who this post does help and berating the OP doesn't exactly ensure that similar type posts will come to light to help spread this kind of information.
Just my 2cents.