Yes, I'm working on article on just this topic that's filled with a lot of examples. I gave a few examples in the article,.

At the same time, I wouldn't look at 100 hours as an exact number and $1,000/hour as an exact number. The amount of hours would vary per person—what skills they currently have and how quickly they learn.

The deeper idea though is to find rare & valuable micro-skills where you could quickly become one of the best.