WoT is essentially a free to play game with in-game purchases available. What would you be willing to pay if the game wasn't F2P? I think of it like it's suitable for Minecraft's console cost, which is $19.99, though I'd prefer to not pay, obviously.
I'd pay up to $25 for it since that's how much I paid for unlocking a Hearthstone adventure. I think that if this game would have a paid version something around $20 would be suitable.
