It's more common that entry-level jobs in highly paid fields start at close to the median wage. Salaries can rise rapidly once you have demonstrated your worth. But unless there is a talent shortage in your field, it doesn't make sense to pay much for an unknown quantity.
And, I love how making $125K is some sort of great salary. I live in MN and while it’s above the median HHI for the state, it’s by no means a comfortable enough wage to save that kind of money unless your housing is covered by family or something.
Here in the MSP metro, you’re looking at $2500/mo for rent + utils or $3500/mo for mortgage + utils for what’s a pretty average living arrangement. Unless you’re making $200K+ you’re definitely not saving shit.
The median household income in Minneapolis is around $77K and they are somehow surviving.
When I did my PhD, I was making roughly the same money as all of my friends (none of whom were in tech) except I had waaay more freedom and job satisfaction.
If your other opportunities are things like a school teacher or generic “office job”, a PhD program doesn’t really have an opportunity cost penalty