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Also, given that interview notifications often come long after one ought to be buying tickets, hotel, etc., you are either asking them to put a lot of money up front in hope, or plunk down way more money after they learn...
And it's not *merely* inhumane, it actively reinforces class biases that academia already struggles with. Some people have an extra $1000-$1500 to spend on this kind of thing. Most grad students (and many junior profs!) don't, and their departments don't/can't pay.
