Because math?
The trade in value listed on the website is $70. He said before the bonus he was only getting 60. Your sarcasm implies I am missing something obvious, for which I apologize. However seeing as I would like to trade in a 3ds xl later today and want to get as much for it as possible, I am still interested in knowing why he was getting less than the website lists as the trade in value. Do different stores offer different amounts, or was something wrong with his system?