Never thought of the Mechanical Turk idea before... sounds like it's worth a try.
So I would recommend trying more than one person anyway and don't let it get you down if the few people you try don't give you a good response.
I wonder what a good budget would be for using it successfully.
I paid about USD$0.05 per survey and spent something like $30 or $40 (I don't recall exactly). I got thousands of people taking the survey, they were from all over the world, all different demographics, and the information was solid -- i.e., people didn't just type "jfalksdfjkjhgkj" to try to steal the money.
One thing to be aware of: since this will be an international audience, their English reading skills will be at various levels. Make sure your directions / questions are very clear and simple.
In my studies, I limited the respondents to the US, because I was getting too much noise from international workers. I also gave them the option of leaving more detailed feedback. Most of them did, to my surprise.