Mechanical Turk: A Brilliant Model... for Exploitation?

In recent months several folks have recommended that we use Amazon's Mechanical Turk (MTurk), a popular business tool that crowdsources simple tasks for very small fees per task.  MTurk has gained a reputation for getting grunt work done quickly, effectively and cheaply.  

I poked around a bit and here are my conclusions so far:

1. MTurk is a fascinating phenomenon, especially if you're a crowdsourcing geek like me.  People participate on all sorts of projects for all sorts of reasons - income, boredom, fun.
2. MTurk could be valuable to Citizens Market in a variety of ways, such as researching information for our company profiles, testing our website via MTurk-driven tools such as Feedback Army, or handling a host of administrative chores that plague our little start-up.  
3. MTurk has attracted substantial criticism on minimum wage issues, namely that US-based employers are paying MTurk workers ("turkers") pennies per task, and that such workers are increasingly sourced from developing countries like India.  Apparently the model is legal, but it does seem to be in a moral gray area that makes me uncomfortable.  
4. Personal ethics aside, Citizens Market could be exposed to substantial brand risk by using MTurk, as one of the corporate behavioral issues we cover on our website is "Employee Wages and Benefits."

For these reasons I can understand why some others are using MTurk but I don't think we should use it here at Citizens Market.  Thoughts?