Next Generation, for my 2 bobs worth, I agree with you.
Sure, it's not right to get screwed by unscrupulous employers, but all this comparison of 'how much someone else gets paid and how much work they do compared to me' is just not the way to go in my book.
You do a job, get paid, if you like your work and make enough money to keep you happy, then you're fine.
If you see someone else doing something else that pays more, the choices are clear - keep doing your own thing and be happy with it, or go do what they're doing and be happy with that; just don't sit there and whinge.