No a black belt is not sacred and holy but as you put it, it definitely means something. If you had to earn it that is. In the world of martial arts they say a black belt is not a master or even an expert, although that would depend on how you got it and the standards you had to meet to get it, but I would say its just the beginning. Once you make black belt the real training and the real learning begins. That's why I believe it is important to get your first black belt provided that your main style is a style that has a ranking system with a black belt. That way when you make black belt, you take your training to the next level, the next level being that you start to learn the real stuff.