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You must provide value to your subscribers, and you must show that you care about them and their well-being. The money you gain from them is a secondary process that occurs when you put their well-being and best interests first- money should NOT be your primary objective or foremost on your mind when you are looking to build a list and send emails to them.
Remember, the key to successful and profitable email marketing is building a list of engaged subscribers who learn to trust you and your recommendations and know that you have their best interests at heart. That’s when you will get many sales from your subscribers, as they will know that you are recommending offers (ebooks, software, membership sites, programs, etc.) that will benefit them in their lives and/or businesses.