I enjoy working. I find purpose and meaning it. I do not let it dominate my life, but without it I would feel incomplete. I run my own business now, and that is very satisfying - but even when I was a corporate consultant I found a lot of enjoyment from spending time with my coworkers, solving problems, and having something to do every day.
For me anyways, a nice salary is also a form of validation and affirmation. That the effort you're expending is valued - at least by someone.