Over the last 15 years, they usually went for about 350,00 Euros. Over the last 3 years, they easily almost their prices. Last 3 ones at Kleinanzeigen and eBay USA never went unter 600,00 Euros / 600,00 Dollars.
And I at least know 2 guys from this forum here that would sell one kidney to finally find one SYNCROS Powerlite fork for their bikes. I currently own 4 of them. 3x black, 1x white. And I am currently having titanium replacement legs produced for them.