I just read the forum topic, "Is Anyone Out There Actually, Really, Truly Doing This? I Mean, Really?" and thought what the?
Of course people are out there doing this stuff on both large and small scales.
I'm on acreage Down Under in a cool temperate mountainous environment and over the past 7 years have been growing a food forest of 300 fruittrees, herb beds, berry beds, raised vegetable beds, chooks and hugelkultur experiments. There's even self seeded fruit trees which are starting to show about all over the forest.
This is not a financial thing, it's a food thing.
Given it is a cool temperate environment, it is possibly more relevant to people in cooler parts of the Northern hemisphere than a lot of the tropical and sub-tropical food forests you see up North in Australia (no disrespect to those people, it's just a different climate this far South at elevation). Bill Mollison's farm is even further South again than my location, although it may be colder here because of the elevation above sea level.
I also submit updates and articles to the Permaculture Research Institute of Australia.