All of us agree that customer service is very important. If you agree with that, give me your reasons?

Any business done is customer centric and for it to be successful one has to take care of their customer. For a continuous business flow happy customers are important and so their service in the form of follow ups, touch base on regular basis, after sales services if required, etc.

Referral business is spread through word of mouth and Happy customers act as Good Ambassadors

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There isn't not one single business that doesn't have customers regardless of the type or kind but everyone is selling something to someone. The best companies are the ones that bridge the gap between consumers and companies to a point were the line is thin. Creating a safe environment for consumers where they are ensured their happiness and companies assured their profit. It needs to be a win-win situation

I definitely agree. Remember that a good customer service is the heart of a business. If you provide a top notch customer service, customers will always patronize your product, customers will promote your products or service to their friends or family. 

Customers are always very specific with the experience they get when entering your establishment, even if they will not buy anything, the experience of good customer service will definitely get a long way.

Long term customer retention.

Increase in business and revenue.

Enhanced marketing as customers spread the good word.

fewer complaints.

Greater job satisfaction.

job security.

Less stress.

Increase of confidence and self esteem.

Greater team spirit.