I only send out emails when there's something really big to announce (like the V3 release) or a new contest, while I've only done that like once or twice for a contest. I'm really annoyed by newsletters myself, sometimes I enjoy receiving a newsletter but most companies totally exaggerate with them which leads to me unsubscring them again.
All I can say is that there will be a newsletter in the future only containing information that you want to receive. I don't have an ETA on this though.