Some are called to it. Some fall into it. Some have never considered it seriously while others have acknowledged it all of their lives and will not act on it. I think that a few would admit to feeling like it would be a selfish pursuit; too indulgent to consider if you have responsibilities like a mortgage and a kid and a tuition payment that rivals the aforementioned mortgage.
Though I am not a numerologist, I have studied numbers and added my intuitive impressions regarding color to the meanings that we know today. It is my experience that by recognizing the colors of what the numbers may represent, and applying that additional knowledge to the equation, you can manipulate a more harmonious and positive outcome.