I am in the Same Boat! My spare rooms look like "The Isle of Misfit Toys"! I was running 4 systems up to about 2001, 3-2 channel, & 1-7.1 HT system. I'm now working on a 2 in 1 system, 2 ch & 5 ch HT. However I still have enough spare equipment in a spare room just shy of speaker cables to build 2 more 2ch systems! I myself must detatch myself from some of these items, & learn to let GO!!!
I didn't think it was all that bad till an A'Gon buddy sold of his entire system 2 months ago due to frustration I guess? He just mentioned to me that when he decides to build another system he's just going one stop shopping in "Frank's Audio Warehouse"!
I just 2 weeks ago answered a thread on a Sacd player that I thought I had sold, only to discover later that I still own it!
I'm doing somewhat better, I have been listing a few items for sale lately, but that's only cause I'm also Buying!!!