Why does Meredith not own a house?

I feel like this has been an on going thing throughout the entire series and it seems like every single season she has a different rental. Following the whole lisa hot mic situation, she claimed that she could own multiple homes if she wanted to. Well why does she not? What could be the reason she decides to spend money on rent rather than build equity in a property? I feel like if I was in the financial position to own a house, not to mention MULTIPLE homes, I would! I would buy the chicest house on the market just to shove it in the ladies faces. Does anyone know why this might be?