Please scroll down for evidence of the types of people who are being given Masters. It's painful to read.
The WebUI now defaults to using the Masters Qual. In order to use this qualification, you are paying 25-45% of the cost of your HITs in fees. So if you have a $1 HIT, you are paying 25-45c in fees instead of the 20-40c you would pay if you weren't using Masters. There are other options which are FREE, and we'd love to talk to you about them. Send Spamgirl a private message so you can learn about how to get your work done correctly, on time and on budget without paying extra for Masters.
If you DON'T want to use Masters, or want to use different qualifications, you must turn it off on the Enter Properties tab of the Create page under Worker Requirements.