Using a Name in The Racing Business

I'm curious. When I was racing in the 80's and 90's, I registered my racing as a non-profit business. Does anyone still do that? I raced a '67 Camaro at US131 and Mid-Michigan Motorplex under "Camaro Fever Racing." It was lettered on the car like they did in the 60's. It was registered under sport recreation. I think I still have my business license filed somewhere.