Is this the following a valid reason for buying articles? If you buy articles you can fill your website with articles pretty quickly. But if you write them yourself it can take quite a long time. Do the search engines really know the difference between a well written article and a badly written article? Or are you saying that humans read them? I only have time to write two or three articles for my website, which means at this rate it will take me a long time to have plenty of articles on the site. I'm not planning to buy any articles, I'm just curious.
I believe the answers to your questions are already posted. If you take the time to read the comments above you'll likely find them.
Speaking from personal experience, buying articles for a new niche website and focusing on Google Adsense is not very profitable (unless you already have a high-traffic website). A better approach would be to use high quality articles to promote your products or services.
You can do it, but you need to be sure that the chosen copywriter will be an expert in your topics. Or, at least, you are an expert, so you will be able to edit his article and correct mistakes.
you can mate, you hire people that write articles, you just need to understand that if you do not write it yourself you will need to double check everything. And it is annoying to send the article back to copywriter to correct it. But it saves time and if you find good writers should be good way to build your blog