No, we don't have hard data on this. We just notice that of the engineers on our platform, we find that the people who make more money generally don't seek out this kind of data. And the people who are more uncertain about what they should be making tend to be more curious and willing to share.
If you are selling data, you will need to be extremely thoughtful, quantitative, and specific about the statements you put out, and be prepared to back them up.
There is a market for doing user submitted comp analysis, but the real value is building trust, which takes a very long time and is expensive.
