Every niche is unique. And every niche has unique individuals that patronize it. So, if you don't harmonize your uniqueness with the uniqueness of your customers, you will always lose them.
But how would you know your customer if you don't know yourself? You have to study, understand and master yourself because that is the best way to know others as you will relate, communicate or market your products to them knowing who you are in any given situation.
Nobody grows their business without developing relationships, good relationships of trust and honesty. If you do not know yourself then how can you expect to know others and how they will relate to you so that both benefit?
Knowing yourself is the beginning of every successful email marketing campaign. If you know yourself, you can easily relate with the other person.