I have a new website about 4 months old. I have 0 backlinks other than a Facebook page I created for the site. I have written 20 articles, and I have paid for 20 articles. So I have 40 articles total. The articles that I paid for, I checked all of them for plagiarism, and all were 100% unique. I also checked the keyword density, and all were around 1% for the keyword. The articles are all about 500 words long. The articles I wrote myself, I did not run them through any plagiarism software. The main reason I didn't run them through any software is because, I didn't reference any other articles when writing them. So I figured since I was writing them off the top of my head, they would have to at least be 80% unique. I did check my keyword density, but after I had already posted all my articles. The keyword density ranged from .80% to 3%. To be honest, I was being pretty lazy when I wrote the content. I believe all of my keywords are considered easy competition. The part that I can't figure out is, why are all the articles I wrote ranking on the first and second page of Google, while the articles I paid for, some are ranking around 100-149, or not ranking at all? What am I not factoring in that could be making half my articles rank well, and half to fail? Density, and word count is all I can think of.