Different strokes. I have a friend whose parents couldn't wait to get rid of him, whereas my parents would have me live with them forever if they had their way.
My mom would have loved for me to stay at home, I personally just feel like if I had I would be a completely different person than I am today and probably for the worse.
edit: I don't know, I guess I just think that being out of your parent's house in your 20s is a good way to get a feel for how the world works. I totally understand if people are having a hard time with work/money/culture and all that. I am just speaking personally.