I don't know , maybe so you have somewhere to live ?
A place that you can't get kicked out of .
A place where you can create a nice enviroment to raise a family .
A place to lock in particular school access for your children .
A place where you are can always remain close to good employment prospects .
A place where you can guarantee living in a well located area for the future that you may not be able to afford later on based on historical property price gain .
A place which gives the benefit of all the above and probably will give you some capital wealth that you might need to use later in life .