You need to focus on exactly what your subscribers want. Deliver benefits in your ezine, one after the other. Your subscribers aren't interested, for example, in an ezine that contains 1 article formatted to 55 characters per line - these are features. But they are interested in an article that will show them exactly how to gain 149 new subscribers per day, especially when the formatted text makes it easy to read - these are benefits. Pack your ezine with benefits, and your subscribers will stick around long enough to read your sales message.
Bullets are a great way of breaking down large chunks of text.
Most of your readers will scan through your ezine looking for points of interest. In order to sell, you must build a foundation to sell upon. Build a good relationship with your subscribers. Invite them to ask you questions and to give you feedback. Answer promptly and efficiently when they contact you.