I don't see the part where all jobs are supposed to pay similarly. I think it's fair to bring up pay differences or that your employer is paying you less. That's how people become aware and get better comp. Staying quiet benefits the employer. Hell, it might even be a good reality check for some people on here who think there are enough high paying jobs for everyone (like all the kids thinking they'll be rockstars or play pro sports) that's not how stats, economics, and competitive markets work.