Because all my music and books (as well as some pictures) was on it with all my favorite playlists and still a ton of space - way more than the 8GB ipod touch handed down to me. Also, way cheaper and less of a hassle than buying a new one.
Took me a b it to pry it apart but finally did it. I also didn't have the special screwdriver to remove the circuit board (perhaps provide that or offer it as an accessory) but I was able to carefully use a mini eyeglass screwdriver without stripping the screws. The battery looked slightly inflated too - like the battery on my actual Mac...
It had a sad face and it sounded like the hard drive was the issue, but I took a change on it being the battery because it also didn't seem to charge towards the end. It was totally worth it.