At the end of the day (its night yes yes I know) it depends on what you play. If a 5 or 6 string suits your style of music then more power to you. But it does mildly irritate me when see songs being played in a 5 or 6 string which can be easily played on a standard 4. I just think what are you trying to prove? I played a 5 string years ago and mostly found myself using the B string as thumb rest. Never played a 6 string.