Forget about your education and experience for a moment.
Imagine approaching someone to offer your expertise and doing business with them. What matters most at that moment?
It's the result you can provide for them and how quickly you can deliver it.
To deliver results, you need education on the subject, experience within the subject, and the skills necessary to complete the task at hand.
While education and experience stay with you, skills deteriorate over time if not regularly practiced - this is why people who learn a foreign language but do not use it for ten years often lose that skill.
The same goes for business.
Once you decide to participate in business, you need to acquire new skills and training continuously.
Education is proof that you have learned a subject, while skills prove that you can deliver results.