My head canon for this is that the only way tptb allowed such socialism without sabotaging it was after reserving a looot of rights and property, especially on Earth, for themselves. There was probably some excuse along the lines of ‘maintaining and respecting traditions and cultures’ that let them keep the bulk of their estates, without having to let the poors (who are welcome to their own vineyards anywhere else) take it over.
Some people are happy living in trailers in the desert. Not everyone wants a big house in a lush environment… And some people just like a bit of misery.