Alright so basically I know the balls are used for playing- but like a parent, what do these toys we buy actually do? Is there a benefit for purchasing pricy items like a computer? Why should we by sunglasses... is it only for when the tama goes on vacation? Are there any benefits for the food? I hear that the diet soda makes tamas lose weight, so is there anything special about eating a hot dog, cupcake, etc?