This is a way a company builds brand loyalty to keep costumers coming back. Costumers would stop buying your products if that product malfunctioned soon after the purchase date and there was no after-sale services. They are necessary to offer on products and services of all types for that particular business to be successful.
As per your description about your company, I think you may earn a maximum brand value. But I think you should continue your business & its makes you more profit.