&gt; Many universities in the AAU survey offered 6,000 students 
&gt; $5 each to fill out the survey, yielding a total potential 
&gt; cost of $30,000. But if you were willing to pay $30,000, it 
&gt; would be far better to pay 600 randomly selected students 
&gt; $50 — a $200 hourly rate for a 15-minute survey, giving 
&gt; students a much larger incentive to respond.<p>This is a good reminder of how important study design is, not just the questions on the survey.<p>The only worry I have is the tiny sample size one would get of underrepresented minorities, which in other studies have been show to have a much higher victimization rate than other groups.