It’s possible they do own houses, but they have stayed living in their rented one as it is ‘the brand’. It wouldn’t be on brand to buy a 1960’s do-er upper. I even think the act of moving house would go against the ethos of her brand. The whole; my life is so perfect, I am deliriously happy, aren’t you all so jealous of me? Kind of vibe. If she moved house it would show that she’s an actual human with real life inconveniences and difficulties. She isn’t trying to be relatable, she’s aspirational. Her whole brand is based on the envy of other people.