I still think doesn't help. I liked the idea and did the turk for one of your questions (this was my first time doing the turk, btw). I was asked to visit a myspace webpage, listen entirely to 2 songs and say which one I like better and why. All this for 3 cents? I did it, cause I am a good fellow but I have hard time thinking of people who are willing to spend 10 minutes of their time for 3 cents.

the FAQ example is a bad example: I can always answer "yes" and then supply as reason "every questions I had was answered". No need to read the FAQ page, of course.

I think if you want to insert any kind of validation system you would have to count the time it took for the turk to answer your question and make sure we are in that range for every hit.