Damn.
How long did it take you guys to be granted Masters? Like, how many hits done? I'm assuming tens of thousands?
2 years. 30K HITs, averaging about 1 rejection per 6K HITs at the time (more like 1 in 8K now).
There is some conjecture that pausing for a few weeks, not turking, then coming back to Mturk, triggers some sort of Masters eval. In my case, I had taken a month off after a few years work, came back and did a week of work, then I was granted Masters.
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Took 3 years to get str11223344 qual, and that took writing the requester annually, and asking yet again for the qual nicely.
We have different experiences with some of these quals. I appreciate trying to help each other, by sharing info.