Why Coca-Cola and other companies are so effective in their campaigns? One of the reasons is… they test their ads. They select a very short group of people and then show their ads to them, this way they do not lose a lot of money.
We suggest you to use the same strategy for ezine marketing. You can buy sponsored ads for a couple of bucks and running this ads for 3 days or so, and if the return on investment is good you can buy a “solo ad”.
Strategy for Internet Marketing 