It seems as though they have changed the very steep prices to more fair prices for future flights. A flight in next week CPH-IAD is now 232 EUR for Plus and 495 EUR for Business. The same prices are also available for CPH-EWR in Oct. and Nov. - so seems like SAS realized that the prices were way too expensive! However the prices are still about 30% more expensive than what I've previously experienced. However they're not 400 EUR for Plus and 850 EUR for Business anymore as they've been the past month or so!