"Sound Enthusiast" is how I like to interpret "Audiophile". I believe a "sound enthusiast" is one who enthusiastically surrounds him/herself with sound/music.
Any equipment used to create, reproduces music (i.e. headphone) is just a tool. If a mono-ear plug can achieve that for a person, though far fetching that may be, then that is the audiophile headphone for that person. Large number of us, myself included, who frequent this forum are more than just "audiophile", we are also "audio-equipment-phile". Though some are more equipment-phile than others.
In the end, it is important to remember that, there is not much point putting on a headphone or turning on the transport if there is no album to play with. And that brings me back to the simple fact, we must all be audiophile. Therefore, whatever you have on right now, is that elusive audiophile headphone!
The artists keep the audiophile going, and for me, W5000 keeps it flowing.