Email campaigns are still the most popular form of online marketing, despite the proliferation of competing methods and venues. This should tell you something. Specifically, it should tell you that email marketing offers real benefits over other marketing tactics. What are the real benefits of email? So glad you asked.
Can you afford not to use email as part of your marketing strategy? Of course you can. I don't think the schwarma place down the road ever sent a single email. I mean, before they went out of business.