Gotta be a smoker, that's fucking horrific.
I didn't see any evidence of that, as a 17-year ex-smoker myself, I can vaguely remember back when my entire computers, keyboards, CRTs, etc. had to cleaned of their acquired yellowed tints (tar & nicotine residues) every 4-6 months... (I can laugh about it now.) Uggggh. The one thing the residue did not do, however (which after looking at these photos I consider a small blessing in those days), was act as a dust sink.
More like, gotta be a slob, I think... I have this image in my mind, probably all wrong, of a "big fat slob", for some reason, for whom the act of opening his case once a year to check for dust build up was just "too hard." The dust build-up is so ludicrous that the only other possibility here is that these are fakes...as in some dust-like substance was imported onto these apparently fairly old computer parts. That could account for the poor quality of the photos--but so could the "slob" theory.
You decide.