I wonder what the study is. I'm currently a grad student at UChicago, and although I work in a computational psychology lab, I have a few friends at NORC, and they're masters of side loading survey questions like this. I can guess this though: the amount you're willing to get paid is most certainly not the response variable. Even though they say "this won't effect your payment" I'm guessing what they're going to do is offer you some random amount of money, and then compare your response to this data.

I'll have to keep an eye on NORC's website c. October.