P.S. is the part of your sales letter that gets read — virtually every time. Even if your readers just skim over the rest of your sales letter. That’s why I always put a P.S. at the end of letters. And sometimes a P.P.S, too. I think a P.P.P.S is a bit over the top, but I know many writers use it successfully.
P.S. gives you one final shot at your prospects —a chance to motivate them to take action; to emphasize your guarantee, your price, or your special terms; to pitch an additional benefit; or to punch home any other important sales point.
Always use a P.S. Keep it upbeat and enthusiastic, and it’ll get read.