I've found a few years ago some people were making more than me at generally lower skill and abilities. So I started giving my other colleagues my past pay history and raise %s and it turns out they were getting significantly less pay. I'm glad for them to be brought up so that my party doesn't seem drastically higher as well when I all for mine.

I've changed job positions and let them know my previous pay since they are in that role now. Sadly I think their pay is generally smaller since I negotiate until I embarrass myself and my friends are women and I understand that the negotiations are less aggressive from that population in general.

I made 12% more than them at the same job role.

And at my current I'm also about that much higher than the bottom paid (a guy internal promotion).

I asked for 12% raise citing my usefulness to the team as a whole. Still waiting on the results of that. It seems I negotiate in a very clumsy manner but still getting better results than those I know about.

Possibly those that get paid less share their pay, but those that get paid more do not?