Because last weekend was an expensive one, so I bought the game but not the system, which I will purchase tomorrow when I get paid. I had more than enough, but I like to keep a certain minimum in my account at all times .
I've had a regular DS for years, but I have so many games for it that I haven't felt the need to upgrade yet. And I want to upgrade my consoles eventually too... haven't had much time for gaming lately either though.