Pay to Win = buy gear with real money which cannot be bought, crafted or farmed in game. In other words, Pay to Win is when an item bought through webshop - paid for real money, but is locked to get it in game.
Paying to get more Kinah (or any game currency) is not considered P2W as it's just a time-warp to get it faster than farming it. For lazies out there who don't want to grind for something, they can buy what's already available in the game to get it faster than others. And that's not P2W.
Try not to create your own definition of P2W, as there are games out there throwing that definition right in your face (Warface, APB: Reloaded for example). P2W is a player who bought gear with real money to be at an advantage against players who haven't paid real money for theirs, just to win and never lose.
I paid for a Mount to move faster than those who haven't got a Mount yet, but can get it through quest or craft. Are you going to call me P2W player? I simply bought the Mount to move from point A to B when questing without spending too much time running around, just makes it easier for me. That's not a P2W definition.