I do beg to differ. You don't need more than a few post-nominal letters, but the more courses you take, the more you learn, the more confident you become, the more effective of a coach you become. I've taken a TONNE of courses (but don't advertise more than a few letters) and I always seek more knowledge. For example, I have a diploma in Past Life Regression. Without it, I would never have had the confidence to practice it. I don't advertise the letters, but they're nice to have. As an aside - I haven't actually done it yet, it's a rare practice.