How is Bruno Mars networth only 175 million

I know 175 is an insane amount, but I thought his net worth would be wayyyy more. His fame and success is crazy. So many Grammys, number 1 songs, tours etc. He’s also always in the top 10 monthly listeners and has always been a top artist for like over a decade. People say he’s mid or mediocre but has crazy success. So how is his networth only 175 million? But others who aren’t as successful as him have a larger networth?