When you start a company, you are a business owner first and an engineer second. It is not the same job.

You may be the best engineer in the world, if you don't know how to find customers and get paid, make good investments, and do all the bookkeeping, or, alternatively, hire the right people to do it for you and manage them, then your business will fail.

However, if the only thing you know is how to do business, then all you need to do is hire a competent engineer and you will succeed.