I will say that 99.999% of those dirty people were PC users haha. Tho I wonder why people put stickers on their mac... seems odd because they'll never ever come completely off, haha.
I must say that, besides Mtv these days, the most disgusting things I've come across were under users' keyboards.
I've repaired in the number of hundreds of computers. Of them, the most disgusting are the older key caps, ie PowerBook keyboards. It just seams they were made to suck in and cling to dirt and, well, things I cannot mention here. Do people normally clip their nails over their keyboards?
I'm shocked, even, that the NEW MacBook keyboards can be so encrusted! How does so much build up get under those tight little crevices?!
What you and every other person must realize is; to normal people, computers are just another appliance, next to dishwashers and VCR's. You might not cry when the printed-circuit membrane on the front of your microwave develops a small crack, but I'm sure there's a Maytag man crying somewhere. XD
Also, I once repaired a PowerBook G4 12" that was covered, no, enveloped in these Andre the Giant stickers. I had to probe and cut with a scalpel to find the damn battery and ram slot. The battery! Who the hell covers the battery?! *slap*