Is there a minimum price for good parquet? If yes, from when does it start?
Check Ebay, there parquet starts at €10 per square meter. Planks from €20. That gives you your entry prices for good parquet.
With glued parquet, you don't see a difference between the €140 and the €25 floors. I know the comparison very well from my projects. The high-priced parquet has a slightly thicker top layer and, for example, the click system is worked a bit more precisely. But it is not worth the extra cost.