The furdom is an alternative subculture, right? Right. So it is only... expected to find this kind of people within it. And let's face it - most furries are rather young.
So when you grab a handful of open minded, young alternative kids, the chances are that you'd find a lot more people with alternative clothing or styles, more people that listen to metal, etc., than you would if you just grabbed a handful of kids with no filter.
Thing is that many "alternative, open-minded kids", especially male, tend to be of the energetic, cute kind that sometimes thinks of themselves as a bit sly or secretive (because they're more than what meets the eye, or they have a "troubled past" or whatever their reason might be.. which is also much more likely to find in this group of people).
And thus... you find a lot of foxes because the filters needed to get to the furdom, lets through a lot of these people.
That is, at least, my hypothesis on the subject.