If you no longer need to work, you are rich.
Define "need"?
I recently inherited several acres of land in rural south GA, including a small prefabricated shed. The shed could be converted into a livable shelter, and enough seeds planted to sustain someone indefinitely, for less than $200. Does this make me rich? Can I become rich by spending some of my savings in this way?
Edit: and if we want to get technical about the definition of work I could barter my property's timber rights to the neighbor in exchange for one of his migrant laborers doing the like 20 minutes of work my garden would require each day so I wouldn't even have to do that