@oberoniaomnia - I didn't listen to these headphones a bunch; I didn't listen to them at all, really - I ordered them, took them out of the box, they sounded awful and I got in touch with the place I bought them and said I wanted to return them. They told me they should have 150 hours or so of break-in. On to the back of the chair they went, with music playing through them but me not putting them on for 150 hours. I put them back on and they sounded totally different, as he said they would, and I kept them.
I'm not a complete idiot and I can tell the difference between sound so bad I wanted to return an item, and sound that is quite good and well worth keeping. Nothing to do with memory. Nothing whatsoever to do with psychoacoustics or habituation; my chair is the only thing that would have been affected by those, and it didn't say anything about it. 
I don't see how this is anything like your situation with all that 'listening a bunch' going on. As for Amir, 'nuff said - I don't care what he cites; that is somebody who I really don't care about what they have to say; I listen with ears and brain, not with some measurement devices. But keep denying other people's experiences if you like.
