Dunno what to say, I've kept my PS2 fat from 2001 clean from dust, never used dirty discs and turned the power switch off when not in use and still looks and behaves as if I just bought it and took it out of the box. My buddy who bought his on the same day I did has had numerous problems and he has since replaced it entirely with a newer model. I firmly believe in the care taken and basic maintenance (cleaning dust mainly) while using electronics matters.
As for PS2 clones, I wasn't aware there were any that played PS2 discs. I'd like to see what if any of you have, I find the whole clone thing fascinating.