Ivory provides no performance enhancements over modern synthetics. It's far less durable. And it's much more expensive; especially for the elephant. On the other hand, I think one could argue that properly treated puppy hides could provide for a very comfortable grip. And as far as I know puppies aren't on any kinds of endangered lists. In fact, we seem to have more than we know what to do with in a lot of places so they'd be incredibly sustainable. It would be like a chinchilla coat except it would be a wrap for your cue.
I'm not trying to be an ass about this. I'm only trying to bring some humor to how and why my view of ivory in cues has changed over the years. And like I said in another post, I'm not going to judge or shame someone for liking it. It's just not my thing anymore.