Is the low IQ independent of the fat or is it just that he's so fucking fat that it has replaced all non-critical portions of his brain for maintaining life and basic sapience? I'm trying to debate if you made a redundant statement. He's just so fucking retarded he can't possibly be this stupid naturally.
Also, I can say I rarely reread books, I doubt many people reread many books frequently. Not for a lack of desire to, but because what limited time I have to read I'd rather spend on new books. That said, if I truly enjoy a book and want to read it again I'll go out of my way to make it happen. Like a good movie, if a book is good you'll make the effort to experience it a second time, but most aren't worth a second pass. I doubt anyone has ever desired to read one of the pigman's books twice, though. Still his lack of rereading books may be evidence of how incapable of enjoying anything he is.