Cph is one of the major cities, and the biggest one. It's also the area with most population density and opportunities. I won't say that you are wrong because I'm not familiar with what you can find 20 min of Aalborg, etc, but I find disingeneus portraing a picture where in dk you can buy a house for 80k USD and leaving out the information that you are probably in the middle of nowhere - no jobs, no public transport, no services. It's not that people "decide" to live in cph or in a major city, they are basically forced to if they need to have a job and do stuff. Sure, if you work remote and like being in the countryside alone you have a lot of options, most people don't have that luxury.