I would assume that an important part of trying to retire early is to choose a career path that doesn't max out at $50k per year.

From what I've seen he suggests two things are necessary to retire early: 1. Save lots of money (which requires making money that you can save). 2. Don't spend lots of money. He seems to be pretty transparent in how he does both. If you want to save lots of money, but choose a career that leads to a $50k a year job, it is necessarily going to take you longer to retire than someone who chooses a career that leads to a $150,000 per year job. I'm not sure that makes it a pipe dream--just that if your time horizon is going to be different based on the decisions you make.