Well right, of course you aren't making any money on the route. The point is that if you aren't making any money, then nobody else is either. If you think this doesn't happen in real life, think again. Here in Cincinnati, Delta has a stranglehold on the airport. If a LCC moves in to town, Delta just drops their fares on those routes to drive them out of town. They don't go to $1.00 obviously but they will go to $50-60 or so. Since that's real life, the CEO/CFO pull the plug immediately because they're loosing real money. In the game, it's fake money and we don't have share holders to answer to, so we can loose a few thousand dollars a day for the entire 10 year round and it's not even going to effect me.
The income lost by running a one plane on a 2x route at 1 Euro that takes up 8 hours of my block time is made up by the other 5/6 airports flying to the destination gate, the other 200-600 flights leaving the hub, and the other 16 hours of flight time on that aircraft.
You aren't exactly "loosing money"... (even though it might say -27,500) You just aren't making as much as you could be.