Comment by pilom

2 reasons come to mind. 1) it costs a fair bit of money to move. Especially half way across the US. Saving up the necessary money for a bus ticket may be impossible (no bank account, don't want to keep that money on you for fear of theft, you won't have a credit card so it must be cash, etc). 2) Support networks. Generally homeless people either have relatives, friends or at least case workers who can help them if they get into trouble. Not everyone knows someone in another city to help them land on their feet.