The Importance of Good Copy: “One of the interesting things about direct mail is that it’s quite easy to measure success rates. For instance in most campaigns they will send out 2 or more versions and then see which produces the best results. This has lead direct mail copywriters to get very good a writing copy that sells.”
In the comments, a link to this (it turns out) classic of direkt marketing copy, which is discussed here.
One of the things I never quite got was the gap between direkt marketers and the other marketers. I guess it’s cultural, I just don’t get exactly how it works.