When carefully executed, direct response marketing can yield massive ROI for you. A sales letter is an important tool for shaping the way customers think of you.This sales letter introduces a new beauty product called "Fair and Beauty Lotion" to Gracemel Kim, general manager of PPKK Beauty Clinic. How to Punch Up a Sales Letter: 18 Easy Tactics. Writing a sales letter can be a make or break time for your business. Have you ever tried (or been tasked with) writing a sales letter? What's the best sales letter you have ever seen which actually worked to sell the product? Copies of 59 of the greatest sales letters ever written. Plus 41 more sample marketing letters you can steal. Sample long-form web sales letter.