How can you say that when workers don't have a choice? What accessible job has professional level pay and is part time?

Nursing

I'd happily work for 20 hours @200k a year. It'd give me time to work on my own projects.

Issue is that virtually no company offers that deal unless you already have noteriety or money at the level of retiring anyway.

I've met plenty of people that do this. They are contractors, they take on a contract, work for 6 months, take the next 6 off. I also know some tax accountants that do this.

I'd say being able to work on and off at that schedule isn't something I can find on a job board. Hence my point above of noteriety.

Most companies won't hire people with a high degree of notoriety. They may hire those people if they have some degree of fame.