I own five. Why? Because I like to have a main bass, a backup, a fretless and a 5 string. The fifth one I got at a steal of a price and I couldn't resist. Every one of the basses I own was bought with "bass money" that I have been shuffling around since the early 90s. Buy low, sell high, repeat. I sold a really expensive rig, and turned that into a smaller, less expensive rig, and funded something else, which I likely sold and eventually got where I am today. Do I "need" more than one bass? No, of course not. But if I can afford it, have the room, and hide most of them from my wife...why not?