If you are doing this in the hope that the value will increase substantially in the next 20, 30 or 50 years and you hope to sell it for retirement money I think its fine. However, if your holding onto it and will some day look back on your life and think you wish you had spent alot of time playing it, then it would be a mistake.

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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives." Blazing Saddles...

Especially if it has the t-top... that way you can outrun the rain.

i have a lot of mixed feelings about this kind of thing... on one hand i think everything is made to be used and it is best to play the guitar or shoot the gun or drive the car and enjoy it to the fullest. BUT in the same breath i am saving up for a very VERY expensive katana (like a real hand forged samurai sword) now... after i spend that money how often will that blade see the light of day let alone hack through bamboo (or other... insert object here) probably never because i will use my mid level swords to hack at things and just look at the "real one" as it sits in a glass case. i am torn because a sword, just as a guitar, however beautiful it might be is a tool that is meant to be used not coveted.
Should you play the investment guitar, probably not. Should i hack at bamboo with my $30,000 sword.... probably not. but i bet we both sure want to!

airborne strat said it for this picker.

Depending on how mystical / weird / eccentric / cosmic / wacked you are, it's possible to envision a guitar as a living thing, just as anything made of any matter is alive purely by the laws of physics and chemistry.

With that in mind, buying a guitar and, "...keeping it locked away like a convict on solitary confinement..." is totally out of touch with what (we) musicians, artists, writers, poets, inventors, gardners, builders...

... do, which is tap into the laws of the universe and "make music."

And in the immortal words of that great 20th century American philosopher, Captain Beefheart..."Play that electric guitar...!"