I think you didn't read right. I want buy unpublished tracks from small unknown and mostly anonymous producers who are selling these tracks on different plattforms with full rights.
The tracks I would buy costs around 300-600 $ each.
Don't have this huge budget yet (that's why I asked if this could interest some people looking for investions).
But as I see it's hard to make it understanding for other I think I will start smaller and buy them 1 by 1 when I can.
Well, those unpublished tracks wont be in much demand and again it will be difficult to cover the upfront cost. Why don't you first try with NCS music. The non-copy right music is free of cost and can be used by anyone. You have to present in an interesting way as most youtubers do these days. Once you get to know about the response and feedback, you can start buying the tracks too.