Well, if you want to hire someone who is really good in your niche, it will cost you something. When I was looking for someone for my niche (because I believe as well as you that the website should not only bring money but also actually help someone with really useful advice), the only good person I found charged 35 GBP per article

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So I rather write all the articles by myself - and I give you the same advice. You can, and even shoudl outscore many things in link building, but if you think long-term, you should have your content best of the best, what usually means- written by yourself.