Again back to the charfoal pencil sets. An artist can have 50 of them and claim the choice of which to use is considered and deliberate, but is it really? Are you going to say a bass player is better with more basses than one with a single really good one ?
You are reaching for a way to justify your gear lust. I think its better to just control your impulses and find new appreciation in a main instrument. The relationship with ones instrument to me is almost sacred and more instruments just dilute that relationship.
I've owned and played my main player since 1987. I bought my one and only Stick in 1989, and still have it. I bought a Ray34 (hardly extravagant) a couple of years ago because I needed a fretted bass (some things even I can't do with my hands) and a bought a fretless 2008 German Corvette because after 30 years my main player is going into semi-retirement due to fingerboard wear and having little scope for further dressing - you could say I've worn away almost an entire fingerboard! As it happens I'm not bonding with the Corvette so it will probably be replaced (on a one-in-one-out basis) by a fretless StingRay in the next few weeks, subject to condition.
I've had a few other instruments over the years, but never more than 2 fretless and one fretted plus the Stick at any time.
I have one really nice amp (Genz-Benz Shuttle), a few high quality pedals and a few other small bits and bobs I picked up along the way.
I have a 1991 Fender Stratocaster that I've had since 1995 and a relatively cheap acoustic guitar that enables me to bang out a few tunes when friends come over and we have too much to drink.
Please tell me about my "Gear Lust".