My fun experiment with Mechanical Turk and behavioral economics
joshua.schachter.org
joshua.schachter.org
Maybe I'm missing something.
To make it more than a 'fun experiment', you'd have to actually offer those kinds of terms. Actually, what might be interesting is to see the difference between what people say they would accept, and what they would choose if they were getting a real offer.
Also I don't think there's an easy way to force a choice between taking different tasks.
The experiment's results aren't even vaguely surprising. It's that it was so easy and rapid to conduct.