My revision 3 Macbook Pro was out of the box for roughly 2 hours before it was outfitted with
1)inCase Frosted White Case
2)Malware Protection Pack
3)iSkin Silicon Keyboard Cover.
The two hours spent was me upgrading from 2Gb to 4Gb of ram (aftermarket) and doing required stress testing.
I do keep my hardware squeeky clean, OS , HD , and external appearance.
At the end of the day, true, its just a tool. But its my tool, and as gay as that sounds, tools work much better when they are clean (i.e. gunk buildup).
Esp. Considering macs have high resale value, a better looking machine will fetch a better looking value, without me having to say "well that dent or that scratch is just nothing it still works good..heh

."
+, I do alot of stuff on my Machines. My day job is server admin virtualizing 2 win xp VM's and running OS X (Mac Pro + Macbook Pro), and at home (Macbook Pro) its used to manage finances, Creative Suite (Audio/Video/Graphics/Photography), hold documents (going paperless), a bit of language (Rosetta Stone), and television (Pinnacle HDTV stick + eyeTV).
A streamlined work flow with a streamlined computer, where I don't *want* to worry about something breaking down because It wasn't taken care of.
Good feeling.