I'm wondering what you guys think of this... I am looking for either a fretless or a good candidate to de-fret. I currently play all 4 strings. While I have no current desire to own a 5 or 6 string fretted bass, I am wondering if playing fretless would be likely to lead me into a territory where 5 or 6 string might be more useful to me than one would be now. Does that make sense? so the question is not about the benefits of a 5 or 6, but if a fretless 5 or 6 is likely to be a better choice than a 4?