If knowing your customer strategy works well, then the world would be much happier place to live because then we won't get any automated adverts on mobile etc.

If knowing your customer strategy works well, then the world would be much happier place to live because then we won't get any automated adverts on mobile etc. I understand your point, but imagine, a recruiter planning to call you only to ignore it thinking 'Oh, s/he a busy person. Let me not disturb s/he'. Not going to work in real world. 'Knowing your customers' usually means that sale-person know how and what a customer is thinking so s/he can bank upon it. It doesn't mean that sales-person should contact only when customer is away from work and is not too busy to talk.