Well, he's likely to get over $16,000 ($3,300 per system, minus the $600 he'll pay for each) for about an hour of work. The people he'll sell them to probably don't make $16,000 per hour.
Making 16,000 dollars in an hour doesn't mean you make $16,000 an hour. That whole day, or even week he's not likely to make a significant amount more than that.
He's 20 and he has $3600 to spend on PS3s. I think he's doing ok.