Native English Writer Required For Articles

I have 22 keywords, I need a set of 2 articles for each keyword. So that’s 44 articles. 500 words Minimum. The keywords relate to internet marketing and are based on SEO and social media. I will not pay more than $5 per article, so thats $220, you will also have more work later on with us depending on your writing. The keyword must be present 1% of the time in the content,so that’s 5 times per each article. There must be 3 headings including the keyword in each article. So that's 3 times in headings and 5 times in each article a total of 8, also once in the title. Writing style: The content is for an internet marketing business, and it must show how the marketing company can help businesses market themselves. Each page will link to a prices page or a contact form, so you have to be persuasive in your writing making sure that people will want to find out more. Instead of writing the company name in the content you will write “company name here”, we will replace it later. I prefer someone who has experience or a knowledge of writing for this industry, although if you can do your research it would be great. Remember these are sales articles so I expect nothing less than someone who is a native speaker and writer. If you aren't please do not bother bidding for this job, you will just be wasting your time and mine. These articles will go on a website for an internet marketing firm that is trying to sell its services to customers. If everything is understood please write in the bid “gotcha”.