Although that type of mission is not illogical, I do not see people using it as a main way to make money. Adding that mission, would mean that Valkyrie (and any other passenger transport ship) is useful mostly for a type of mission, that people will not really do. Citizen ships to me seem like just part of the world, that are going to appear in civilian fleets. At least I can't imagine myself acting like a spacebus. You could argue that someone could make the payout big, but how large the payment can be, to make it worthwhile. At least usually in games you get the big buck to transport one or a couple of important people while you know you will be attacked because of that.
With that said, like I take as something normal to see "useless" civilian ships, as part of the world, I guess seeing missions to transport civilians would not be a bad thing. Not something overly useful, but definitely will not break anything. Of course there are the people that will want the game to be less cluttered with missions they never take and along "less" immersive. Personally I never minded the clutter, as long as it makes me feel more into the world of a the game.