You can write the best darn article ever written, but if you rely on just one article for your entire marketing campaign then you won’t be very effective. On the other hand, if you submit 100 articles per day, but those articles are utter crap, with misspellings, grammatical errors, keyword stuffing, and other undesirables creeping in, then you’ll be ineffective as well.

The key is to manage both aspects of your marketing campaigns. That said, you can use the same keyword in multiple articles, but you have to ensure each article is a quality article and that you aren’t duplicating your content. That’s when you lose value.

What I meant was, if for example I have an MMO blog, and on my first posted article, my keyword/phrase is “make money online.” Is it necessary that I use a new keyword on my second blog article such as “earn money online”? Will it be useless if I use the “make money online” on the next articles since it is already present in my first article. Will it be helpful in terms of SEO, if I use a new keyword for every article that I post on my blog?