I agree with his statement, imagine operating your business for three years without improvement, you should let go of it. Because if you're really into that business you would do something that will help for your business to boom. If its no progress then it would be consider as a hobby. However, there's a scenario where some businesses are not meant for you, therefore you can connect your hobbies to your business for example, you really like collecting shoes and you've decided to resell as a business. Then it would be easier for you to have an idea on how to run your businesses since you have a good background on how to handle shoes.