They're not all deranged! Some are completely productive, functional furries. Probably. Maybe.

Also, your statement is far too reductive! There's plenty of avatars with scales! Also, don't forget the anime girls that are actually middle-aged men and the occasional sentient burrito.

The suspiciously wealthy software developers, astronauts, pharmacists, game devs and artists that build high quality 3d models, Blender and Substance Painter tutorials and add-ons that prop up a good percentage of the VR headset market, Patreon market, and have a thriving artisan ecosystem?

Sure, but by furries for furries is a market. By normies, for... nobody? Isn't.

What do you expect? Did you see the movie ready player one? This kind of experience is ideal for furries and cosplay types and they featured in the movie too.

If you can be anything, it makes sense it attracts people who want to not be what they already are.