Karl Fogel at
Interesting points. Some countries do have an entrance tax; as long as it's steeply progressive (in the economic sense, not the political sense -- yikes, the word "progressive" has really gotten overloaded) then +1.
Yes, all for price discrimination; also apply to other fees and penalties too, especially on statistical murderers, ie drivers. Meanwhile, the present system is steeply regressive -- people from rich states pay nothing, people from poor states pay steep financial and personal costs. A flat entry fee for all would be extremely progressive relative to the status quo.