Lots of people balk at the need for regular newsletters to be sent to a customer list. Mostly I think it's because so many doubt their writing ability. It is true that some people write better than others and there are some who really can't write to save their life. That's just how it goes, as humans we all can't be good at everything. But even if you fall into that non-writer category that's no excuse.
You don't have to be a wordsmith to send out a professional newsletter, no matter what you are selling. Try creating a theme for each newsletter. Then fill it out with product pictures related to your theme. Then all you really have to do is write a small blurb about your theme topic and tell your customers it's on sale. Not so bad, especially after you do it a few times.
It might be hard and a little scary but newsletters will bring you repeat customers. It's a reminder that you're around, something an online business definitely needs. The Internet is a vast entity with many other beings floating around in it. Try to think of the websites you visited for the past month, you probably can't name more than a 1/3 of them, if that. Help your customers help you.