The most important thing for most website owners is to get traffic to their website. A great way of doing that is to have a blog, where you regularly publish interesting articles about topics which people might be interested in.
Of course, the hope is that people will find it and share it and then your internet profile will increase which should ultimately lead to more sales.
Blogging is a full time job for many businesses, or if you are a very small business then it's something that you should aim to do a couple of times a week, just to keep the content fresh.
Most of your blog posts will be read by few people but now and again with persistence you can get blog posts which get picked up and result in many views.
In reality it's a numbers game.
I hope this has been helpful - let us know at Sellr what you think!
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