Short answer: Because it is the right thing to do.
Watch on YouTube.
I have been a long time believer that transparency is a good thing for good people and good businesses. If you got nothing to hide, you shouldn’t have a problem with transparency in business. It will help the good businesses get better and get rid of the bad businesses quicker.
These are a few quotes from the video.
I also stumbled across their open salary policy on their blog which is the most transparent of any company I have ever seen. They explain the open salaries a bit more in the video below. It is also well worth a watch.
Watch on YouTube