This article is from 2013, not reflected in the HN title.
I seriously doubt the following statement in the article is still true:
"The users of Mechanical Turk are still early adopters, which explains why so many workers are closer to the median US household income of around $50,000 than to the poverty line."
I did some survey work on MT back then, it was fun for a few days, then became incredibly mind numbing.
A more recent article on MT (probably posted already to HN):
http://www.npr.org/2015/05/22/408680035/mechanical-turk-work...