May be we have to define the swords and markets
0 -- 5000 € low end, no papers, bad condition, no polish...
5000 - 15000 € medium, papered, good condition, ( old) polish
15000 - 50000 € good, TH or Juyo papered, flawless very good condition, good polish
50000- 250000 € very good to exellent, Juyo and Tokuju papers, extraordinary textbook condition, exellent polish by high ranking polisher
for the really top end swords there is no presence in the western markets. A Hagenbusch or Piech collection wasn't seen on official western markets, 90 % did go go a calm way back to Japan..
Best