Know a guy who's iPhone app uses MT to do pseudo-automated video image/motion recognition & processing. He had to train & retain his Turks, who seem quite content doing the work as an ongoing project. (Not sure if he wants further details revealed.) Between this and the article, seems the untold story may be that blind/random "turking" may be frustrating & unprofitable, but finding & developing a relationship on a project can work well for all involved.