Yes but the algorithm also is that they take 5% of your assets each year. So if you've saved $1M (not much for a $200K a year couple in their 50s), that's $50K a year out the door.
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An actual graduate tax would be far less regressive than the current system
That would mean people that get great paying jobs right out of college would pay more than they even borrowed, but it would be justified because the degree would likely have had a big impact if it was so soon after finishing the degree.