How can Cold Reading benefit our life?

I found this topic to write about, according to the TV serious “Hustle”. In Hustle, the actors gave us a basic concept of Cold Reading. By using it in a right way, cold reading can make us achieve a lot of goals, normally in interpersonal communication. Albert told him to observe target’s exterior such as the rings on the finger, how they wear their tie, how they comb their hair, how their face look like. Cold readers can use different details to infer the interior of the targets. For example when we see people eyes which were red and swollen, we might think that the person might be experiencing an emotional changing. We also know that people in a nice suite maybe a rich and successful. This is basic cold reading we have already used. But in the studying of cold reading there are much more than this. In Hiroyuki Ishii’s book “Cold reading”, the author introduced us what cold reading is specifically. He divided it in to seven parts, communication, observing technique, how to run business, how to deal with colleagues, love, facial expression, and normal life. The purpose is to let you get to know strangers, how to make them feel that cold readers understand them. There may also be an interesting issue that I also like to discuss about. Is that how can we use this technique properly? Because it may be used by some people hoping to do bad things, so cold readers might have ethics when they are using the techniques.