Why shouldn’t client kill ads you presented?

Why shouldn’t client kill ads you presented?There is no greater joy to a client than when a customer responds to his ads — and buys the product. So simple, yet conventional wisdom has it that sales are dependent on quality, price, distribution and need for the product in the customer’s life. Advertising comes in after all these are in the correct order; neatly excluding the impact of the ads, or lack of it.