Ha, ha. It's a bit like trading Panini stickers at school: 'Have, need, have, have...' ? I think you should be dusting off that box in the garage and putting these on display. Their stock is rising!
Just to touch on the 'hipster' element mentioned above, I definitely think that is a factor. There is no argument that the sound quality is awful and that it gets steadily worse with age. But as Daymo1202 was saying there's a lot of nostalgia wrapped up in these little U2 artefacts, especially for those of us from the pre-digital age!!