Worldwide, there are 3.8 billion email users, so if you're looking to find a way to reach your customers, email is the perfect place to find them. Mail produces an average of $38 for every dollar invested, which is a return on investment of 3,800%. 66% of consumers make a purchase as a direct result of email marketing. When it comes to acquiring customers, email is 40X more efficient than social channels like Facebook and Twitter combined. Amongst this all, the strongest argument to use email marketing is that you own the platform completely. There's no external body that can influence how, where, or when you reach out to your users.
We believe these are pretty good enough reasons for you to start email marketing asap.