Personally, as a Scottish tax payer and someone who used to live in Dundee, I don't mind the route being subsidised if it brings in people to the area who then spend money which wouldn't have been there if not for the flights in the first place. I have just returned from a visit to the city, my first for a few years, and there, sadly, appears to be no advertising of this route anywhere. The airport has a large sign advertising the STN route, but oddly, not this one which is surely more beneficial?