I have friends who have done exactly this. They grew a small agency to about 15 people and are happy with it. They enjoy what they do, it’s a nice place to work, they make plenty of money from it and have no desire to be rich.

The mist valuable thing money can buy you is time. If you make enough for a comfortable living, with a good work life balance and great people, and your own gig, I would consider you very rich in deed!