We're still figuring out the best way to cut down the conversation and still pull meaningful insight for the companies we source for. That said, we've worked with companies to trim the conversation down to an average of 5 minutes so we can quickly shortlist relevant applicants.
The "usual suspects" answer is that the students there are elevated in quality relative to other schools.
For a similar concept, I lost a job as a teacher that paid $20k / year after taxes. For a year after that, my job-seeking strategy might be best described thus: http://xkcd.com/874/
Then I got a job (in software development, not teaching) paying low six figures (...before taxes. Watch the magic of accounting render two similar things nearly incomparable to each other). Does that reflect the incredible (in excess of 100% annual return, say) effectiveness of "fuck around" as a way to get jobs?