Fundas of Marketing applied in relations

It was my second class of Marketing, everything was hazy, not actually because of the professor's lecture , but because my mind was not there in the class instead it was roaming around the globe, standing a witness to my dreams. I had just started enjoying my future when suddenly I heard someone say “ your wife is your customer and if you don't satisfy your customer someone else will”, now I generally do not listen to the professor when I am dreaming but this statement was interesting. Now those of you getting weird ideas, hold you horses, its not as bad as it sounds :-).
It was in that 90 minutes that I realized the importance and meaning of the statement. If we believe in it and act accordingly we would not only make people happy around us but would also help our self to lead a happy life.
Let me explain, ask any successful company what is there prime objective and they would say “to satisfy our customers” , and then ask the same to a company suffering losses and they would say “ to make profits”.
I know it sounds a bit weird to any non marketing person, but try to understand any company can make profits only if its customers are happy
hence if a company functions as if its only motive is to satisfy its customer then profit follows automatically but if it only runs behind profits then it forgets to fulfill the needs of its customer in the long run. Of course it does not mean that the company should NOT be concerned about profits – after all one has to be pragmatic.
Now let us apply the same to relationships, I am sure all of us acknowledge the fact that all relations basically function in the principle of give and take, now I know some of you will not accept this sentence and would quote examples of a couple or the relation of mother and son, but think again are these completely selfless relations, don't u expect your husband/wife to be loyal to you, don't you expect certain level of love from your partner? Doesn't a mother expect certain respect and love from her son? doesn't a son expect love and care from his mother? and if this expectations are not satisfied the person seeks the same from elsewhere.
So I hope you agree that all relations are actually give and take. Now once this is said, let me define a customer , as per my professor anyone whom you give something either in product or service is you customer.
By this analogy our friends are our customers as we offer them help, emotional support , and much more in the form of friendship, by the same analogy you would find all the relations around us are basically customers, and hence if we do not satisfy there needs they would go to some other person, for example if you do not satisfy the basic needs of your friend like helping him/her in time of need, giving him/her the emotional comfort of a friend, he/she would find an alternative friend. Its as simple as that.
The moment each one of us start thinking this way, we would make everyone around us happy, and since they would also treat us the same, we would also be happy. But the problem is that we only focus only on ourselves, we want to satisfy our desires, and hence end up hurting others and eventually ourselves. The sooner we realize this fact the better our personnel life would be.