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It is important coz it is also a marketing.
1.you can cross sell other products with him.
2.your product gets publicised through his word of mouth.
3.Customer Satisfaction which is important
pre-booking for the next order without any investing & advertisement
By keeping good relation with the coustomer, he will aproach to you for any future need. Secondly your product will get mouth publicity which will definately bring you lots of new coustomers.
gaining his trust which will make the costumer pleased and probably comeback again, he will also recommand your shop to his friends ensuring that you are a good guy