Vesa has worked out that the Helsinki Philharmonic pays its chief between 10,000 and 15,000 Euros per concert (US $13,000-15,000) and a half-fee for repeats.
Nice work if you can get it. Outside of France and the major German cities, this would seem to be in the upper range of European fees for 2014. Vesa reckons it is average for Nordic capitals.
Let us know if you have further information.