A Final Point

Take the time to build a relationship

You want your readers to feel they're getting valuable content from you and thus will stay subscribed to your list. You can't do this if your only goal is to make money each time you send out an email. You need to take the time and build trust; and then you will find when you do send a promotional email, the number of people that actually buy from you will be much higher. People will trust your opinion and will be more inclined to buy from you when the time comes.

And finally,

Always continue building your list.