Generally there are records on Discogs that are at a very good price, but the problem is when they are around 100 € or 200 €, or even reach 1000 €. And not to mention when they are no longer in stock.
Nidostar, what you mention seems like a good alternative to me, it is cheaper and I also imagine that all the music libraries will be there, from Patchwork or Cavendish, to Octopus Records or Viaggio Attraverso i Problemi Dell'Uomo.
Imagine, would it be possible that on a site other than Discogs, an album like "Silvano Chimenti - Droga" that is valued at 3,191 €, could cost a maximum of 200 € on another site like the one you mention?
The only bad thing here is that if it is put at that price, I consider from my point of view that it would lose all value, due to its few copies, the use and time it has had, and also the artist.
In reality, there are too many things that make it so special to sell it for such a significant figure.