I am definitely not a hoarder but I do tend to hold on to certain things. Mrs GreyWoolfe used to give me grief about all the wood scraps I would keep after a project. After a few times of needing a piece of wood of a certain size and I would get it out of the scrap pile (and not have to go buy more) and give it to her, she stopped giving me grief. Do I need 3 oscilloscopes? Nope, but the 3rd was only $5 for 100 MHz. Do I need 9 multimeters? Nope, but I like multimeters and non of them, including the bench meters was over $100, half of them were $50 or less and I try to use every one.
I am in the same boat as you but with tools. I have accumulated enough stuff that I have long grown out of my Craftsman rolling chest. In a couple of months, Mrs GreyWoolfe will be coming into some money and she has stated that she is going to seriously upgrade my tool box for me and has budgeted up to $1K so I can get what I need to get organized again. No getting rid of anything. I have my own enabler.
Sorry, no reality check here. If it is test and measurement equipment, go visit the TEA thread. Plenty of enablers there to encourage you to keep it all and buy more.
Maybe this is like bringing a case of beers to share around at the AA meeting - but everytime I've thrown out accumulated bits of scrap and recyclable items, I've later needed them. Look around the room. See all that air? That's usable storage space!
Right there with you!!!