Problem is that AAR is extremely poor located - and only for very few persons it make sense to fly from Aarhus to Copenhagen, as DSB and car often would be both faster, ceaper and more convienient.
You have a fair point as it relates to transfer flights - but I guess it hard to justify a high frequncy just for that.
Ihave the pleasure of weekly CPH-KRP flights - and there you can talk about a challenged business. And as this on bloody DY, who has very limited transfer options, most of my Jutland based colleagues use BLL as their departure point for international travel.