What are the needs for retention?

Need for Retention:

There are several interesting facts upon the basis of past researches about getting a customer and retaining him.

a) Obtaining new customer costs five times more than satisfying an existing customer.

b) Onto an average, companies lose ten percent of customers every year.

c) The customer profit rate rise over the lifetime of retained customer.

d) A five percent reduction in customer attrition may raise the profit rate by 25 to eighty five percent.