Purpose of corporations is to make money. It's a tool. Nothing less and nothing more. Using people work is the way they are doing it. Expecting something different is very naive.
I think the only wise way to cope with that is maximize your output and minimize your input. If you are here not for experience or mission itself there is no point in undercutting yourself. You can't expect loyalty from a tool. You can expect common decency from a management but that's different story.
Don't become only cynical. It's just how it is. It's an opportunity for you to get more money and experience. From finance perspective it's usually a win.
Good luck! :)