Boring articles don't generate traffic, nor do they increase sales. Low quality blogging can only hurt your public perception, and destroy your brand identity.
Back in the early days of the Web, you could just put a lot of keywords at the bottom of an article to reach the first page of search results. But it's not 2010 anymore. Search engines have grown in complexity, and they only promote well-written, informative, and enjoyable content.
Do you want search engines to promote you? Do you want website visitors to sign up and open their wallets?
You need to educate. You need to entertain. You need to "WOW!" people with your content.