1 month out of 12 doesnt make economic mathematics. Look at the figures for mid winter particularly in biz class. No one will fill this route in a hurry
If you discount the months of airport closures due to Snow at beginning of the year and then the Volcanic Ash Cloud, pax figures have been increasing ahead of last year, and so much so there is the real prospect of beating August 2009 of 9,622 pax, the highest ever monthly figure since the route began.
So as AirLCY has said, at the very least there are grounds for a seasonal service.