I think "to avoid taxes or get free stuff from the government" was an essential condition on what you just quoted. And for what it's worth I think I agree -- I don't think I know anyone who has moved to a state mainly for tax reasons. (Though I do know people who have avoided moving to California, allegedly because of taxes.)

Though maybe the fact that people can move to take advantage of state giveaways, is a big constraint on the way they're currently designed? What conditions does Alaska put on its Permanent Fund payments?