(unique to location?)
The point of my previous (slightly snide) post was to say that all of the above are unique to location.
Certainly, in one of the dojos I trained at in Japan, I was the only caucasian, only about half were university educated and nobody worked in IT. I would say that the reason for this is there were fewer than 10 caucasians in the city and no IT jobs in the area.
It might be wise to limit your parameters a bit. For instance, only ask about the types of people who do aikido in larger cities in the continental US (I imagine Hawaii would skew your results a bit).