I've just finished comparing various documents; and it turns out that Mechanical Turk falls under one of the categories of my monthly deposit's rules, in that for every dollar I would be paid from performing Turk tasks, fifty cents would be deducted from my next monthly deposit. Thus, even if I put $4 of effort per hour into Turk tasks, I would increase my actual income by $2 per hour of effort; which, while more than $0, is still pretty low... the local bus costs $2.50, so I could increase my effective income by more than that per hour by simply spending my time walking everywhere rather than taking the bus.

Now that I know of MT, I'm going to keep it in the toolbox of potential options in case of emergency, but with my current understanding, I'm unlikely to make it a regular thing. (Unless I can come up with some way to do Turk tasks while doing something else at the same time, or find some other 'cheat' to increase its value - as usual, and suggestions would be appreciated.)