I have a bit of a philosophical dilemma, and photography is here used as an example to describe it.
Since I started photographing in the 1980s, there has always been a Pentax 35mm SLR in my camera bag. I have never been without one.
I've had several of them, K1000, ME, KX, MX, and Spotmatic. Probably a dozen in all. Today I have one Spotmatic that needs fixing (Thanks TSA!), one KX that suffered the same fate as the Spotmatic (Thanks TSA!), rendering both inoperable and with no time to fix them myself, or knowledge how to, are awaiting service. I have one functioning KX, and a new to me MX. There are a number of lenses I own, the 28mm f/3.5, the 35mm f/2, the 50mm f/1.4, the 55mm f/2, and a 100mm f/2.8. All are awesome lenses.
Much of the equipment among the Pentax SLR stuff is basically given to me by my father. He gave me my first camera, and once in a while he either sends me a lens, a filter, or something, adding to the pile of Pentax stuff.
These cameras have been used very well over the years, but it has come to the point where they no longer serve me and my somewhat failing eye sight very well; I don't use them much anymore, and a Leica M2 is what I use for 90% of the things I photograph with 35mm, and I also have a Canon EOS 3 that I have started getting lenses for (a nice 85mm f/1.8 is in the mail). When I have the EOS kit complete the Pentax will be 100% redundant.
Enough beating around the bush... I don't want to keep what I don't use, basically. But all these things are tools I have been brought up on in photography. They're my little camera friends.
Would you keep it or sell it? Granted, they don't take up much space, but that's not the issue. I don't want to look at them and long for 'the good old days' and want to use them anyway, and screw up a shot because I can't see well through the viewfinder.