why have companies persisted for so long in spending more on getting new customers than on keeping the ones they have? What would persuade them to change course?

If retention is so much more profitable than acquisition, why have companies
persisted for so long in spending more on getting new customers than on keeping the ones they have? What would persuade them to change course?

What are the differences within a CRM implementation project between a mail-order customer and a company that supplies electronic products in the consumer and the
business markets?