#7 is very important. Narrowing down the target market to consumer specifics such as age, income or home value can help improve conversion rate from 2% to 50%. I see it far too often that companies just send random mailers to all addresses within a certain zip code. It’s totally ineffective and ends up being a waste of money. I recommend purchasing a list, it’s generally very cheap and greatly increases your chances of a successful direct mail advertising campaign. 

Once your list is targeted, you need to spend an equally large portion of time coming up with a great deal – even if it means you might lose a bit of money on it. The underlying goal of any marketing campaign is to gain new customers, and it’s worth it to significantly reduce your profit margins to gain said customers. Once you have a surgically-honed list and an amazing offer, then you can spend some time on the design, copy, delivery methods, postage rates, date of delivery, size of the mailer…there are a lot of other options to consider, but following the 40/40/20 rule you can see how important audience and offer truly are.
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