That's completely fine. I have no issue with people working hard on a product they are proud of at a big for-profit company. It's good to like your job, it's good to like your coworkers, it's good to be happy that your software is being used by lots of people, or if you built something that you think is really cool. I've certainly take pride in such things and I certainly do not mean to diminish that by saying "we all do this for the money".

I just think it's important to be honest with yourself, and realize that a job is transactional. When I work for BigCo, I am selling my time and/or expertise for money and/or benefits (e.g. health insurance). If the company doesn't feel like they're getting their money's worth out of me they might fire me. If I feel like I'm getting a reasonable enough compensation then I might go to another company.

Such is the way with capitalism; I don't love it, but until we change to a different system that's just how it is. I absolutely hate when companies say "we're a family here", because that's simply not true. I don't get cut from being my parents' son because I'm not meeting some bottom line this quarter.