I know it's going off topic but I totally agree.
Nothing annoys me more at work than a warranty repair on a PC that is full of dust.
I clean them outside the building using an air compressor and I always charge the customer for doing this.
In fact, there have been a couple of times where the CPU has cooked due the cooler being totally blocked with dust.
The pleasure I've gained from voiding those warranties was ace

I can't fault Sony for their stance on that one but I can certainly fault some of the idiots comments on the link.
'It's Sonys fault for producing a dust magnet' - well duh!
'it's the owners fault for being dirty and lazy and not knowing how to use a dustcloth'.