In almost any industry, if you're passionate about doing a great job and making people that buy your product or service as happy as possible, it's really fulfilling.
Elon MuskIt is a mistake to hire huge numbers of people to get a complicated job done. Numbers will never compensate for talent in getting the right answer (two people who don't know something are no better than one), will tend to slow down progress, and will make the task incredibly expensive.
Elon Musk