Kids unknowingly racking up charges in iPhone games

The article i read was about how people was upset that they was being charged for apple app. with in the game. like the smurf villiage if you buy certain things they charge you and really don't know like Maybe you buy a wheel barrow for the village and they would actually charge your credit card the amount of what the wheel barrow was. i have this game on my ipod and i brought stuff i hope they didn't charge my card because i would be upset and i really think that is a scam and they should fix it . or they are gonna have a lot of people who will be upset about it.