Does this really work? That Fabian Tan guy on Ezinearticles pops out like 15 articles an hour or something! He focuses on the general topic of working at home, making money online, etc. How fast would you run out of keywords? Would submitting multiple articles using one keyword prove to be effective at all?
From what I know Fabian has people who write for him and he does other niches using pen names so you won't know what else he is doing. I don't advise submitting more than 2 articles for one keyword if you still want the keyword, build a squidoo lens instead
Building multiple articles and submitting them all at a time is not advisable. If you really want to target that particular keyword, then wait for a week or two and then submit another article. That way it will help you to achieve backlinks with that particular anchor text.