On the topic of eBooks, why on earth is the iBooks Store so useless? The selection seems to be tiny and the only way to browse is through very broad categories

On the topic of eBooks, why on earth is the iBooks Store so useless? The selection seems to be tiny and the only way to browse is through very broad categories like 'non-fiction.' it's like Apple out it up there just for show and don't seriously care about it.