As many readers have probably heard, Amazon's Mechanical Turk will soon (July 22, 2015) be charging substantially more for its services. Before, Mturk took 10% of what researchers ("requesters") paid workers. Now it will be effectively 40% (in the rare case that you need fewer than 10 distinct participants, then it's only 20%).
Naturally, some researchers are upset, as documented at The Chronicle of Higher Education ("Researchers Complain About Changes in Amazon Tool Used for Surveys").
Two quick downsides that stand out to me:
(1) Running even a small x-phi study on Mturk will more likely require grant money, which is scarce in the humanities.
(2) An increase in operating costs will probably motivate researchers to still get the same mileage out of their funds. This makes it even less likely that workers will get paid a living wage, which is an ongoing ethical issue with use of the site.
Any reactions from the x-phi community?
(Note: If interested, this blog recently featured an excellent post on the status of Mturk as a research tool.)