The most difficult part of having a woodworking business is being a salesman.
Meaning, finding people to buy your products, at a fair price.
There are thousands of hobbyists out there trying to sell items they make on their CNC. Many of them sell items so cheap that they basically are working for free. If you try to compete with these people, you won't make any money.
The key is to find a product that people want to buy, at a fair price.
If you have a lot of other woodworking tools, think of the CNC as just another tool. Use the best tool for the job. You may find a product that sells well, but reuires very little CNC work.