Should I use a focus keyword more than once?
It is the search term that you most want your page to rank for, so when people search for that keyword or phrase, they should find you.
Unless you’re a high authority site and you’re already ranking for a specific keyword, you should NOT use it more than once. Ranking for that one specific focus keyword is possible if you write an awesome cornerstone article about that focus keyword.
Another reason why you should not use it more than once is that you do not want to compete with your own content for a position in Google. If you optimize two different articles for the same focus keyword, you would like to have both posts to turn up in Google.
You need to have a site with quite a bit of authority to rank with two articles in the top ten search results. If you’re already ranking with one of your articles in the search results, you’ll probably have enough authority to try and rank with a second one. If you’re not yet ranking on a focus keyword, never use it twice! Update and improve your original article and write another post surrounding a slightly different keyword.
At the end,regularly adding quality content to your website in a blog is a very good SEO strategy. Google sees that your website is active because new information is added and you increase the volume of your content.
CEO COMLife - Circles of Online Marketers