Not everyone will have paid £50 or £60 though. Airlines are the masters when it comes to yields.
Remember this is GSM's first winter @ MME there will be some routes that will not work, TFS however must be doing ok for forward bookings as GSM aren't shy at ditching a route if the bookings are low. ABZ is a prime example - their base opened around the same time as MME's and it is closed for the winter.