Requesters will soon be able to upgrade to AMT's elite masters qualification workforce for an additional 3.5 to 4.1 percent on their total bill. The overall amount paid will be more with thenew AMT fees scheduled for July 22, but the new lower percentage fee for masters workers makes that workforce less expensive comparatively. It remains to be seen whether this will result in a large shift towards hiring masters workers, or a bolstered reluctance to swallow the extra fee.
Clickworker charges a fee for posting paid tasks, but they won't tell you how much. According to the Clickworker FAQ page, fees are discussed once you make contact with the website. Other sites like Mturk charge a requester as little as 7% on top of the amount paid to the worker, or as much as 45% on top of the amount paid to the worker.
The most prolific workers on Microworkers have earned close to $10,000. Microworkers lets end-users view all workers and sort them by criteria like country, most tasks completed, and the like. Mturk doesn't have this feature. Mturk has its own special features, but the site will begin charging more than twice what Microworkers charges on July 22, 2015. Requesters with 10 tasks will pay a 40% fee to Mturk as compared to the 7.5% out-of-pocket fee at Microworkers.
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