I think you're getting the sentiment mixed up. People aren't sacrificing their own wellbeing in order to increase their company's, but rather, they find the work they do personally sayisfying and rewarding.

For instance, I enjoy my job, I don't dread Mondays. I like my coworkers and the work atmosphere, I enjoy creating tangible value and I find the success of my work projects intrinsically satisfies me. But at the same time, I don't work weekends, I don't work outside my ~40 hours, and I don't sacrifice my wellbeing for my job. So I work hard because of the personal satisfaction, I don't do it to make already rich people even richer. I don't know how it is for others, but personally if I didn't get some level of internal satisfaction and motivation from how I spent the working time of the best years of my life I would be quite depressed.