1. We were moving. They had to come off the shelves anyway. 2. I've got more books than shelves. 3. Until I figure out my book/shelve situation, the bins make

1. We were moving. They had to come off the shelves anyway. 2. I've got more books than shelves. 3. Until I figure out my book/shelve situation, the bins make it easy to keep the books out of the way in storage, but turn up a particular book when I need it.