... there is this corruption of sensibility that sets in after the first few decades as a music nut, where you get more of a buzz from contemplating shit music than good music. 

Not so much actually listening, but the idea of trying to understand it, work out what its appeal is, how on earth the creator thought it was a good idea to bring into the world. 

Shit music can be better food for thought than good music, which somehow explains its existence more simply. 

I say "not so much actually listening to shit" - but there is a stimulus from the sharp tang of something really rank and abject.... it's like an aural palate cleanser.... or a reset (or even 'rest; which is how mistyped it first) of sensibility

You get bored with your own likes and preferences.... the predictability of the reactions, how you're wired 

It's interesting to wonder, what if I was a person who loved extreme metal and only wanted to listen to that.... and had consequently developed finely tuned discrimination for the different shades of aural offal.... what would it be like be like that? 

It's a kind of decadence maybe.... like Des Esseintes in A Rebours, the lengths he has to go, to get off... 

Well, of course, Eno said it first , said it punchiest:

"Really awful is more interesting to listen to than pretty good"

Which is the epigraph at Hardly Baked 2, whose output is largely if not wholly based on this approach (ShitBrit, the Bad Music Era, etc).