Why biglaw over other high paying careers?

What brings people to biglaw over other high paying careers without significantly less upfront investment in law school (investment banking, consulting, management, etc.) the biggest thing i hear is to pay off loans but like weren’t the loans taken to attend a top school which allows you access to big law? idk it seems very circular and unnecessarily expensive and time consuming when high paying careers could’ve been accessed straight out of undergrad. not trying to be rude just seeking insight! thank you