Well okay, their reasoning for releasing wow token in the first place was that it reduces the amount of people being scammed. If that really would be the reason it would make sense for it to come for classic too. On the other hand it has made gold selling boom even harder cause now gold is never worthless, and it seems they are fine with it as long as they get a cut.
Personally i don't think it should exist in either iteration of the game. Something in me just doesn't allow me to spend hundreds of euros on a dinosaur mount and that mentality didnt exist before i could actually buy shit with gold that was worth anything in real life.