i have 5 at the moment. They all do different things... they sound, look and play different to each other. It's nice to have options.
I have :-
Classic Jazz (pasive)
Precision (passive)
Modern Jazz (active / passive)
Dual Humbucker (active)
Electro Acoustic Bass.
Could do with a fretless, an EUB and a DB so I have all bases (basses) covered (But even then will still probably want more!)