I work very late into nights on the project I created. I hate myself sometimes for doing this because this now the company's cash cow and I get nothing more tha

I work very late into nights on the project I created. I hate myself sometimes for doing this because this now the company's cash cow and I get nothing more than any other engineer. I've contemplated quitting but I see no benefit to this, it's still one of the coolest projects I've worked on. It's not just legal ownership that can drive people.