What pet do you want more than any other pet? What would you do to get it?
I suppose the Ethereal Soul-Trader, but I wouldn't spend the $200 for it on that . So how much WOULD I spend on it? $60 at most. I understand it is too rare to cost only $60.
Ingame, the answer would be Minfernal for Kalimdor Safari. So far I've created a Death Knight on a low population realm and camped it in Felwood. I've also camped my Mage on my home realm of Dath'Remar there.
BUT would I steal a Minfernal from someone else? Would I run ahead of someone and cut them off? No. I wouldn't be able to do that.
But camping it? Yeah, I can see myself doing that.
Edit: 27th May 2015 - Ethereal Soul-Trader obtained via AH! Also I have tents now.