Gothic love is a subculture which touches on many things beyond music and fashion, though those are the most readily identifiable aspects of it. It's hard to put the finger on any set ethic or philosophy to the gothic scene, as gothic people are generally love many different things (some aren't even interested in the music or fashion at all). My own take on it is that one common aspect of the gothic scene is a desire to step outside the mundane everyday humdrum and find something a bit different and more exciting.
This can be through fashion, music, artistic/poetic leanings, alternative religions/philosophies and various other interests and subjects generally associated with a somewhat bohemian image.