I tried to make it clear that I was talking about the person who was offering professional services for a fee. Not an "amateur". We are in total agreement that while you may in fact be VERY good at doing your own taxes, does not make you an accountant.
If you read over the article carefully, you will see I was specifically addressing those individuals who hold themselves out to be professionals and earn a living doing what they are doing. Hence the analogy with Tiger Woods.