courteneyfish: Some companies are just very specific in the type of people that they want the opinions of.
I agree, the companies do have specific requirements. For example and Airline based in Asia will not want the opinions of someone based in Nigeria, who has no disposable income and a destination they do not fly to,
Having said that (and not knowing what the survey was for) I do find it disturbing that racial groups would be disqualified (and on the assumption this was the reason).