Let's say you're using PPC as your primary means of generating leads for your business. You need more leads, and decide to bid on the term "infographic generator" for $2 a click. At the end of your month-long campaign, you generated 1,000 leads and spent $10,000. Not bad. But what about next month? You have to spend $10,000 again. And again. And again. That is, if you want the leads to keep coming. In other words, when you turn the faucet of money off, leads stop coming out. The same concept applies with list purchasing, tradeshow marketing -- anything where you don't own the property from which leads are generated. Now let's contrast that experience against, say, blogging.
To have the best chance of being read, your letter should be open and airy-looking with short paragraphs--including some that are one sentence or even one word long. (A one-word paragraph? Here's how: Write something like "I have one word for suppliers who say they can't offer you a one-year guarantee." Follow that with a one-word paragraph such as "Baloney!" or any similar word you want to use. It is a real attention-getter.