There are compulsive travelers, who can't/won't stay in one place. Our society doesn't cater well to the always-on-the-move because it's both rare (most people stay put) and difficult to cater to (wanderers rarely earn much money)

There are also those that can't/won't accept responsibilities like maintaining a house, paying bills, etc. Our society caters poorly to these people because we are not full-on socialist; adults must accept responsibilities to function in our world.

Those are two rough groups that come to mind.