Shock because the price seemed to high, or too low? This seems reasonable / a good deal to me. I recently found the website useful- they have a lot of data, and offer a good incentive to acquire more data (Add a salary / review to see more).
The expected path for startups is: 1) find product market fit 2) build growth 3) build revenue 4) move to a sustainable operating model where at least your gross margins are positive 5) move to cash profitability 6) congrats you've made it and now are a normal sustainable company
Glassdoor was on step #4 and was probably close to #5. Valuing based on net profit would only work on companies in step #6.