For several years running (5?), I made most of $200K, 3500 miles from Silicon Valley (and 120 miles from the nearest large city). It wasn't for being a rockstar, it was from stacking two fulltime jobs. It was a lot of hours, and it sucked. Industry was 'webdev', and it's as stable as you want it to be.

Anyone can do it today. I still could. I just refuse to, now.

My advice is to not worry about a magic number, as long as you're comfortable and happy. Nowadays I don't even always hit 100 in a year. But we old guys really do get high off of things other than money. Things like a happy wife, a house full of animals, and a sailboat that goes where the wind takes it.