It will indeed be a deal at Deauville, for the airport has some history of offering significant "marketing support" - in the region of 20 Euros per passenger - to encourage and sustain routes. It's hard to see why else you'd fly three Embraer 175s a week to Birmingham otherwise.
The whole strategy seems to be challenged, and they are fast taking over where bmi left off for erratic route and scheduling decisions. To launch a load of routes from Birmingham and can them six months later is odd, but having taken the decision to stop them, continuing to fly through the dark days of January and February until the end of March before stopping is even more bizarre. Losses must be racking up, and if they do register a profit then it can only be because a relatively small number of routes are particularly strong and making enough to cover the others.