Wrong? Well, yeah, technically you broke the law, which is bad. I get upset personally when there's some douche bag 14 year old going on about how awesome he is at [insert M-rated game here] and how everyone else sucks and eats dick and how he's sleeping with my mother ect. There's violence and naughty language and sexual situations in video games, not as much as television or movies, but hey, they're in video games too. These are "mature" thingies and parents that buy their pre-teen Grand Theft Auto it gives more fuel to the argument that video games make people jerks, I mean violent. It's just a game, it's not like it won't exist when they turn 17. If they want to smoke, see rated R movies, or have sex 'legally', then they're going to have to wait for the appropriate age. Besides, I highly doubt they had jobs and earned that money, probably given to them via parents.
If we don't follow stupid rules, then stupid people will make stupid accusations.