I'm long out of sales and been in IT for 20+ years and I disagree. When I read the book what I took was everyone has a relationship bucket with good and bad feelings on a person. It's a long slow process to build up the good bucket and it's easy to drain it by filling the bad bucket.

That book really helped me understand the hidden cost of how treating people can impact your career.

Why I think it's useful, in IT a lot of people are socially inept.