Rick Bier presents 13 of it's benefits. Building such a relationship is the best way to build your business, on or off the Net. It will bring people back to your site every time you tell them there is something new and interesting there. It's a great way to prove your expertise in your field and establish your credibility. It can generate qualified leads very inexpensively.
Advertising revenue can make a free e-zine very profitable.
You can notify your prospects and customers of special offers. It can be almost free to produce and distribute to hundreds or even thousands of people. You can have world-wide reach. Some e-zines have subscribers in every country in the world. You can deliver very timely information.