As we all know Nicolai is a successful model, he is also a brand ambassador for various luxury items, expensive watches, perfumes and maybe other things. I could imagine that he earns so much money that he can finance his current lifestyle. Maybe he wants to take advantage of this as long as it is successful and only later look for another job based on his studies. He's not yet 30 and seems very straightforward and ambitious.
But I admit that he is one of my favorite royals, so maybe I am prejudiced