> Show monthly income of 1000000 ISK. Over 7k USD. Why?
I'm not familiar with the reasoning for Iceland specifically but in another country (Switzerland) I was in the position of having to apply for long-term work visas for myself and some of my employees. There they justified the high income requirement because they wanted to know you weren't going to bring in cheap foreign labour and thereby undercut local wages. So you had to show that the wages were high in absolute terms and that you weren't paying less than the national average.
I'm not familiar with the reasoning for Iceland specifically but in another country (Switzerland) I was in the position of having to apply for long-term work visas for myself and some of my employees. There they justified the high income requirement because they wanted to know you weren't going to bring in cheap foreign labour and thereby undercut local wages. So you had to show that the wages were high in absolute terms and that you weren't paying less than the national average.