I own a small business (NOT related in any way to home brewing) and it's not everything you think. The costs of keeping the doors open is painful and prices for everything keep going up. Insurance, liability, rent/mortgage, personnel, yada, yada, yada. Oh, don't forget how we were supposed to be the paperless society. Good lord, the paperwork BS puts me over the top.
Yes, it has it's advantages but whatever fun it would be for awhile, if you are depending on it to raise a family, the fun ceases quickly.
Hobbies are great, WORK is a four letter word!
Best of luck to you should you choose that route.