Anyway, my PC, being pretty beefy, happens to be quite loud. There's quite a few things I like doing overnight, which can be done in linux. Speed isn't an issue for these tasks.
Now I must point out that one of the reasons I opted for a PS3 in the first place, over an XBOX 360 was that the PS3 could run linux. I am still on firmware 3.15 so I can run linux.
And the linux on my PS3 is pretty cool for the things I want it for. It's also a lot quieter than leaving my PC on all night. Sure I could build a quiet linux box, but why bother? My PS3 works fine for the job already.
And as for linux being the poor man's windows, then please can you tell me why the vast majority of the top 500 supercomputers in the world are running linux instead of windows? Not to mention that most of the internet is delivered via linux boxes.
Maybe you don't understand linux that much, eh? Maybe people like you should just stick to windows. It might be easier for you.