Why doesn't the Macbook work lid-closed??

I've only just discovered that the Macbook will try to go to sleep every time i close it's lid. For me, this is possibly the most annoying thing that any laptop could ever do!
I know the Macbook is designed for lid closed use when external keyboard, mouse and display are connected. But if it doesn't overheat in this situation, then why should it be a problem without any of these connected!?
I use my laptops esentially as desktops. Download and encode video overnight, play mp3's 24/7 and don't want to leave the lid open for dust to collect just to be able to do these things.
Can anyone think of anything to explain this crazy behaviour? Or vouch for the use of software to work around this, such as sleepless.
Macbook (White) 2.0GHz   Mac OS X (10.4.6)   - 2Gb RAM, 80Gb HD

Wtihout knowing Aple's specific reasons I would think that it were a safely reason. With the lid closed it would hence but unknown if it were on. There are no lights or anything to say this so potentially you can grab it and move it as though you would when off. Thi s could be extremely bad, even with the sudden motion sensor.
When it is connected to an external monitor you will at minimum have to disconnect it and USB mouse/keyboard which does give you time to think that it's on.
I have the same issue as you do though as I have a PowerBook currently running as a server. I use a very high tech device to keep the lid open just enough to keep the thing from sleeping.… it's called an eraser.

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