Let's look at what someone would believe to also believe that sharing their salary is a good idea. 1. that if enough people share their salaries, it will cause

Let's look at what someone would believe to also believe that sharing their salary is a good idea. 1. that if enough people share their salaries, it will cause salaries to revert to the mean, increasing the equality of outcome, independent of inputs. 2. that the data will be real, and not sabotaged or cherry picked. 3. that employers are somehow obligated to pay more than people are willing to work for, presumably just as you make up the difference from shopping at whole foods by paying the ethnic grocer an extra few bucks, because justice, and they're just so grateful, amirite? 4. People with poor negotiation skills, aka those who have less to offer, will make more money. Yay, sample bias. Now I get to know what people stupid enough to share their salaries earn, which is useless, because if I wanted cogs with minimal value add, I could offshore the work for less. Seriously, if an HR person ever used that site as a data point for why they made a crappy offer I would say, "yes, I can see that's what you would pay someone with a misunderstanding of how the world works for this job." Put another way, if you have any doubt about whether someone is overpaid, don't worry, they'll tell you.