My 2 cents
I hate having things that I don't need because everything you possess you are possessed by. Even if it doesn't cost you any money. So what is too many for me:
I've been playing bass for 5-6 years, and I'd been primarily a guitar player before. When I switched to bass I bought a $300-some 5-string because I needed one, didn't have money that time, and did like its sound. On the fifth year of bass playing I finally bought a decent fretted 5-string, and approximately the same time I came to the necessity of playing fretless, and I also bought a fretless, also 5-string. So now I have 3 basses including my first one, which now needs some repair, but I'm going to make it and keep it as a cheap backup bass. And I definitely don't need a fourth one. I don't need a bass with more or less strings than 5. I thought about an EUB, but when I got my fretless I realized that I didn't actually need an EUB... at least, that's for the next five years, I guess. I've seven FX pedals (not including the volume pedal, 'cos that's not an effect

), and I MAY consider which effect could be my eightth but I'm not gonna go for it because I don't really need it. And, surely, I only need one practice combo. Though I played many basses, FX and amps aside from the gear I own, and I did really like some of them, I'm not gonna buy any of them.
I also have an acoustic guitar just for practice, and I recently started recovering on keyboards (just borrowed from a friend, currently looking for what I'd like to buy for myself) - because our band came to need some extra keyboard parts, which I could play when the bass is not needed. And you know what? I do not have enough time to practice my fretted one, my fretless one and keyboards! I dream of adding an electric guitar again to my arsenal, and I even know which one I would like - tried it in a store - but I clearly see that I can't afford recovering seriously on a guitar so a guitar would be too much!
Also I hate buying instruments. I spent toooooooo much time to find a fretless of my dreams, and I'm not gonna spend a minute choosing one more instrument. Also, the more instruments you have, the more time it takes changing strings, polishing finishes, and adjusting truss rods twice a year. The same about FX - you buy another pedal, and then you find out that there are tone suckers among your patch cords, which need replacement... The more you own, the more of a hell your life becomes. I'd better just play all that time!