We could make up lots of good reasons for not moving though. My parents are sick and I need to be near them. My wife / girlfriend / boyfriend / life partner has a job / sick parents / other commitments where I am. The US won't let me into the country for any number of completely idiotic reasons even though I'm not a criminal (visas are hard). I have a personal objection to the TSA. The point is that for a lot of people moving very very far is legitimately either not an option, or not a very good one.
(the humorous half-truth stands though, at least the store bought stuff I've had when I've been over there. Bread should not taste like sugar...)