I think 2 C Tickets at 390€ is an absolutely great price and 2 C tickets at 390€ a piece is a very normal price.
PS. You will never find a C ticket with Aegean to Germany for 195€, no matter how much you rant about it. If you like to fly business, then pay the higher price! If you don't think the regional C offers much over the economy, then wth, just book a much cheaper economy, especially if you fly that often.
PS2. "Has lost it" implies there has been a dramatic change in their fares. There hasn't been any change,so did you just start flying?
PS3. Emirates has lost it with their F class fares