Some of most effective targeted traffic comes from effective keyword research and quality content around those keywords. As you know, search engines love content and they especially love content that is delivered from a targeted keyword or keyword phrase.
While it is true that writing articles is time consuming, value for an online business can be extremely high.
I've been fortunate enough to reap strong benefits from posting articles to web sites including my own, and leveraging right keyword phrases to deliver content.
As you do same (or post other people's articles) and search engines index your pages, you'll see more and more traffic coming to your site via that content.
And, as your pages "settle in" to their positions in search engines results pages, your site will be 'maturing', and that concept can be worth lots of money to you.
As your site matures, you'll most likely 'cement' your pages in search engine results pages as long as you have your articles posted on deeper sites and optimize your articles. One big drawback to posting other people's articles is that you can't optimize them.