Because that's just the way I am. I love non-human-like anthros (from most species at least) and can't tolerate anything else, as my own character that is, other people can be whatever they like it doesn't bother me.
No I think you're actually a lot more common than extreme hard core furries like myself. I've been a furry for as long as I can remember and would almost rather die than loose this aspect of myself. But I'm pretty sure I'm in the vast minority.
Edit: Even I don't make the furry fandom "THE...
Spore was kind of fun. It got boring too fast though because even on hard it's too easy and it's annoyingly difficult to make any species that I want to look correct at all. The only realistic thing I can make is birds!