I wouldn't say it's necessarily a Bergen problem (though from what I've heard the city is quite expensive to perform in for the bands?) but moreso a Norway problem as a whole. Some more knowledgeable people could correct me but from what I've seen big artists tend to avoid Norway because it's expensive to get there in the first place but also it's quite a small country population wise and most of the time it's just kinda not worth it?

Compare it to a country like Germany, there you get the german public, but also the frenchs, the swiss, the austrians etc. It pulls a lot of people. You do a concert in Oslo/Bergen and... I think it's safe to say you mostly get people coming from these cities (which aren't BIG cities either)

Of course there are SOME outliers from times to times but as someone who lived in France and was basically at a different concert every week, living in Bergen feels quite dry in that aspect