Search Engine Optimization
A client of mine has been entertaining the concept of offering a paid newsletter. It certainly seems compelling: Write an ongoing valuable stream of content to attract more and more subscribers, which equates to more and more profit for roughly the same amount of work.
My reply was to note that this model was more popular ten years ago, although it is certainly still in existence today. However, as the earlier success of online (email) newsletters grew popular, the concept of offering them for free, as a low-cost marketing media, also garnered success. So much so, that in this day and age, free newsletters of some sort are so ubiquitous that they REALLY need to be compelling to stand out.
Regardless, that does not suggest that “you” should not consider offering one yourself. Or stated more specifically, you should offer something free in exchange for the email addresses of visitors, so that you can build a relationship with them and keep them connected to you, which will make them more amenable to paying money to you. (Read What Are YOU Giving Away For FREE? for more info).