Well, on the dates I searched for above those prices were competitive (for ZRH you can fly cheaper with LX, but then you would not get as good schedule). But in general I could not agree more with you. If SK keeps their current prices, they will continue to fly around with more or less empty C class.

I think the prices above are in the right range. If they would keep them as standard week-end prices I would be happy. As a short campaign it's not worth that much though..