Today, that is no longer the case. In most instances, the horror section has been absorbed into Fantasy and Sci-Fi, which means it's only the big names on show, while new, and event established talent is completely overlooked.
Adam Nevill is a good example. Adam is one of my favourite writers of any genre. He has won the August Derleth award three times and The Ritual had a major movie release, yet his books are nowhere to be seen - certainly not in any of my local bookstores. This all gives the impression that the audience for horror fiction is too small to bother with.