My opinion, I think this is to get people to buy more gralats...like yeah tokens work...but after a while of buying and refunding you run out of tokens..then you go to gralats...well it semi-forces you to get them...because if you don't have enough tokens you have to pay with all gralats.. (if I am correct).
Also, maybe like add a way of buying them with gralats...So like for example Amazon...you pay 99 cents for 100 Amazon Coins...maybe do like 999 gralats for 1100 tokens or something.