Yes, yes I do.
I don't look at a picture of Onyx and say "That's me." For me, it's just like having a character on Gaia or Maplestory, or a persona. It's something that you have and people say "Hey, that means that it's you." Do you actually have to think you ARE a lion, or a wolf, or a cat? No, you don't. It's a symbol. Just like your username. People look at it and they know it's you.
It's really a logo or a mascot until you start saying "I AM this" but the majority of people don't. They know the difference between reality and make-believe. And if that's something people find fun, I don't see what the huge problem is.
I'm really fed up with all the people who think they can set the limitations for everyone else. "Oh, it's only okay if you do it like THIS" or "you have to do it like THIS or else it's dumb" because you know what? Having a fursona is something that's supposed to be fun. Doing something like making yourself an avatar is so that you can be a part of a community where you enjoy yourself.
What fun is it if everyone's caught up in sniveling at everyone else? Why would anyone spend their time, when they could be doing ANYTHING ELSE to say "eww, this fursona isn't cool because of this this this this this, I don't like it so it obviously negates all credibilty this person has."