Yeah, it's the loss leader strategy, or razors/blades. It's a win or die kind of strategy that is incredibly risky for this very reason.
The idea is to sell hardware at a loss, to insure that the product is inside people's homes. And then when everybody has one, they go out and buy games, accessories, movies ect, and you profit on that. But unfortunately it hasn't caught on, software isn't selling as much as they would hope due to competition, blu-ray is still seen as luxury rather than necessity, ect ect ect. It's the kind of strategy where you have to win to profit, and if you don't win you lose big. It worked for the PS2 which had the same strategy, and I think the PS1 as well. But during those generations Sony was cleaning house.
Nintendo goes with a completely different strategy, they are a far more conservative company. So even during bad times they make a small profit, and it good times they become the second most valuable company in Japan.