No offense, Fishy, but you need to relax. The OP never mentioned anything except the popularity of the PS3 on amazon, which it seems, the PS3 is popular there.
And as to your original post, it might surprise you to know that the DS isn't selling as well as the PS3 ON AMAZON.
Threads of Interest:
The Movie Thread: http://www.vgchartz.com/forum/thread.php?id=6880
The Crow Eating Thread: http://www.vgchartz.com/forum/thread.php?start=0&id=3886
The Betting Thread: http://www.vgchartz.com/forum/thread.php?start=0&id=7104
Custom GIFs Thread: http://www.vgchartz.com/forum/thread.php?id=18963
The Greatest Game Ever Conceived On Any Platform
Tag: "I have tasted Obi-Wan's bitter tears"