Why would you have guitars you haven't played in years? What's the point of having them if you don't play them?
when i bought the LP i played it almost exclusively for several years, and i'm sure i will play it again in the future. if i were to sell it and then want to have one again, it would cost me more $$ to get another one, so i just keep it.
the acoustic gets played very rarely, but when i need an acoustic (camping and such) it's the only thing that will fit the bill.
the 175 i've had forever and it needs all new electronics, but that is very low on my priority list and in such shape, i would loose my ass on selling it. and i still love that guitar for what it is. a beautiful big jazz guitar.
the turquois strat i got new in '96 and was my main guitar for a long time and it's in semi retirement now. and there's no way i'd sell it.
some people don't keep anything they're not using currently.
some people basically never sell anything they buy.
i've sold a few things in the past and then regretted the hell out of it. if i had all the guitars i sold/traded back in the 70's right now, i could retire on the $$ they're worth. not that what i have now will EVER be worth that kind of $$.