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Posted by Adam Weisman
I think it differs from platform to platform. But, after having spoken with a number of workers on MTurk recently, it seems on that there is a surplus of low-quality work on that specific platform. Turkers say they see low-paying jobs stay on the platform for days and even weeks at a time because the community has, in effect, decided to boycott them. Had there been a surplus of workers on the platform, I think such boycotts would be less effective. The best way to look into this is to sign up for a number of platforms and see what the situation is, as well as try to contact experienced workers to ask them for their opinion.
Hope this helps!
Anton
Anton's right about Turk; since it's a fairly established platform, there's more than enough work to go around. On less-popular sites, however, I think you'll find that the opposite is true. The workers, who have nothing to lose by signing up, do so readily. The clients, however, are taking a risk if they sign up for a relatively unknown service.