A question about article.

Is Konent Machine article don't use second time can be Tier 1?If somebody tried this?
Or I just need to buy article in marketplace with content?

I searched a lot of post on internet but every result is buffer site I think.
So I don't know if it is really good and unique as them said.

If it need to buy tier 1 article,100 words with don't use for second time is enough?

I suggest you change your username. That last part specially.

These days people SEOs are using tier as their secondary money sites. So, manually written unique articles for each property is the way to go.