People are complaining because $400 is still a lot for a game console that's been out for almost 3 years. And in case you haven't noticed, the PS3 hasn't exactly been a hit. Yes it's sales have been decent, but it's a fraction of the 360 and Wii sales. So that's why game developers are...
stereo bluetooth gives you the ability to listen to music or anything via wireless bluetooth headphones. But you have to buy the headphones, and is it worth it? That's up to you