My storage space expands each decade. Most good stuff I keep, even if it is "obsolete," as I will use it occasionally. I do give a lot of stuff away, but the storage requirements continue to increase.
Actually I have been working in the garage the past month or so, re-arranging things to get rid of my wife's junk that I have no idea as to what it is; to make more space for my more valuable gear that should take priority -- as responsibility for garage keeping has been assigned to me -- watch out for what you wish for Dear.
Gawd, I hope she doesn't ask where the turkey fryer or some of those other I-don't-know-what-they-do appliances are. Seems they went to my favorite charity, without permission from the boss :)
I almost gave away the sewing machine I found taking up valuable storage space, but thought hmm... maybe some day I might need it to make something. So I kept it. But it is not in the gear storage area yet... it is in the ever decreasing "Her Stuff" storage area. If I do need it someday, then I shall acquire it through eminent domain :)
Edit: We'll I better get back out to the garage, she made me stay home this weekend to get it done, since I have been out hiking "too much" the past 3 months. Since she just left to go shopping to buy more useless non-hiking stuff, I have another window of opportunity to par down the non-essential storage areas.