When I was working nights at Ardent Studios in Memphis, I would use the dead time in the wee hours of the morning to practice. A producer came into the tape room and pointed to the C,G and D strings on my Warwick Streamer 6 and said, "That's not bass, that's not bass and that's not bass." Then he pointed to my A,E and B strings and said, "That's bass, that's bass and that's bass." I own two "extended range" basses, a 5 string and a 6 string as well as a 4 string AGB and a 7/8th upright. The majority of the parts I get paid money to play could be played on all 4 instruments. My upright teacher calls the notes between the nut and the heel (frets 0-7 on an electic bass) the "money notes". I'm not a blazing soloist or two handed tapper. All my instruments are used primarily rhythm section work. So speaking for myself the reason my electrics have the extra strings are: 1) I can choose where to put a part bassed on the tone of the string. If I want clear and punchy, I'll play C below middle C on the third fret of the A string. If I want ballsy and more bassy, I'll play it on the 8th fret of the E string. If I want tubby reggae thud, I'll play it on the 13th fret of my B string. 2) I like being able to play all my first position notes from my 4 at 5th position on my 5 and 6 string. The fret are closer together and I can play with less effort. I also like being able to play a chromatic scale in all 12 enharmonic keys in first position on my 6 string, if I add the open strings. 3) The C string makes it easy to add double stops to my popping when I slap. I also makes is easy to add open voiced chords at a position on the neck where I can throw in a few "bass" notes as well. This is great for filling in space in duet and trio situations when the other guy solos. So why do you juggle more than EADG?