TL;DR: Anonymous Poll ‘Scrum Master Salary Report 2017’
The purpose of this anonymous poll is to create a clear, data-backed benchmark that allows everyone in the agile community to get an understanding whether her or his compensation is adequate.

The report will cover Scrum Master as well as Agile Coaches, both employed and freelancing.
To generate an acceptable first report, we will need at least 500 answers. A larger sample would allow providing more detailed insights, though.