That's interesting. I guess it depends on perspective - yes you could be a "rockstar" dev who talks at conferences and makes gajillions writing scalable MVP's for SV-funded startups. In which case, yes, your value is directly linked to your ability to market yourself.

But most aren't. Most devs clock in, write some code, clock out, go home, do something completely different. It's a job. They operate inside the salary bands of their organisation, and they do okay, doing normal work.