I hired a local SEO guy 5 years ago and he was a scam artist. I discovered that he used black hat techniques ( he had poor results) and I fired this guy. I learned the lesson the hard way and paid $1500 for nothing.
Ironically after that, I did a better job myself. That's perhaps the most enjoyable part of my business to compete with SEO gurus
As long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost and science can never regress.