If I feel like standing in my kitchen naked while drinking milk from the jar I don't have to worry about "uncle or aunt whoever", or anyone else. I also don't have to worry about relatives being bothered when I listen to Rammstein at decibels, or disliking it when I do any number of things that I do... like drinking milk straight from the jar in the refrigerator maybe.
Privacy. It's why I pay for my own home... even if I lived smack in the middle of 100 acres I'd want to live there alone (except for the husband), with a gate so that people couldn't just randomly show up at my front door.
Yes, I'm a bit of an introvert, and so is the husband... I'm OK with that.