I personally know two people who earn their entire livelihood from permaculture. No trust fund, no second job, no outside income, little to no money from books or classes. One of them does make some money from youtube, but hey, he’s diversified, and I’ll bet if that income stream disappeared he would replace it with something else in the permaculture realm. They both own nurseries, they are both waaaayyyyy beyond organic, hard core permaculture with very few compromises. One is Edible Acres, the other is Twisted Tree. Of course a big part of their permaculture practice is that they have figured out how to live well on way less money than the average westerner. So yes it absolutely can be done! However if you are someone with an appetite for lots of expensive stuff, no it probably cannot be done. But the whole point is to live well while making an extremely minimal impact.