Let's be fair, We didn't even need the poll, Just look at most beast vids and you can see who's into it the most.
It is sort of unusual that most zoos are white. The question is, why is it that way? Like I said, I think it's because most zoos (on this forum at least) are from English-speaking countries like the United States, United Kingdom and Australia, and most of the people in those countries are white.
However, there may be another reason for it that hasn't been discovered yet.