Article Writer Needed (On Going Work)

I am currently looking to hire a quality writer for my growing site portfolio. Your job will be to write articles on various topics and niches. I am going to need anywhere in between 20 and 100 articles a week. This is going to be a long term relationship (ongoing work). Each articles will have 1 main keyword (title-subject). Each articles will also contain 3-6 extra words that will need to be used in the articles. Basic Requirement : - 100% Unique, must clear copy scape. Copied content will not be accepted and will terminate our relationship WITHOUT PAY. - Each article should be in between 400 and 500 words. - Good/Native flow of English, readable and interesting to read. NO GRAMMAR OR SPELLING MISTAKES. - Absolutely NO computerized article spinners. - Must have at least basic SEO elements in the articles. - Should be able to insert the main keyword about 5-10 times in the article and use the other keywords here and there. - Follow my INSTRUCTIONS. - RIGHTS for the articles are transferred to me, ABSOLUTELY NO RESELLING, PUBLISHING OR REPRODUCING the articles to ANYONE ELSE. I will pay ONLY for article that I APPROVE (shouldn't be a problem if you follow my instructions). The pay rate starts at $1.50 per articles of 400-500 words and rate goes up after a while if you perform well. I will pay you via Paypal once a week for the work done and approved. NO UPFRONT PAYMENT Include any sample of your previous work in pm. Please type "JON" in your bid & pm response, so I know that you have read and understand the description OR I'll ignore your bid.