Interesting. That API could be very useful, but they're going to have to watch out for BlackHatters - I bet they are already looking for ways to exploit their system.
There are some that have made amazing use of Mechanical Turk without actually getting caught - that is one vector I think the affiliate industry has greatly overlooked.
I guess it could work if you abstracted it enough so that it's not apparent to the worker, but it wouldn't be trivial to execute. Using VAs on Odesk might work better.