In my opinion, Article writing is not a "Get Rich Quick" Job. Yes, I call it a job, because to me it is. It has taken me over 1 year to finally get my first $100.00 check from Google. I just started writing full-time and have seen my revenue jump up. However, it took me a while to learn how to write articles that convert to sales (clicks).
Furthermore, it took me fiddling and experimenting with what works and with does not work. Even if you pay for your articles you still need to know your audience, niche market, SEO, and the like so that you can know a good article when you see it (ie buy it).
Therefore, In my personal experience, you would do best to learn article writing, spinning, SEO, and page ranking to name a few. It takes an average of 30 days to see any real money on a particular article. Also, you never know which article will bring you in the most money. I always write an article and think this is the one and an older articles traffic begins going through the roof! Google loves aged articles and the only thing you can do is write, build, and wait!
Remember, content is KING and only you know your niche market well enough to write about it!
In conclusion, I would not invest $1,000.00 to buy articles when I can lean how to write them for free here on HubPages!