personally I always had the mentality of
"I'll just put it on the side for now ...
never know down the road if I will ever need it again with gear"

But after a while I had honestly NO Room anywhere...
all the stuff was never used and dusty as heck...
it was so bad i wouldn't even sell it off. So I read tis book, talked to some people in the business who went thru similar hoarding episodes and after a while, one piece at a time I started give gear away to people that wanted or needed it for FREE.That helped me to get rid of stuff and to make me feel better
doing something good for other musicians too.
Little by little I felt better, my rooms looked a lot better,
"happy wife, happy life too",.. and I was slowly cured of the disease. Now I am in a frame of mind that if I need it I buy it,
if I don't use or need it....I eliminate it somehow.
But I will never keep it here for no reason.
Whew!! I feel better just talking about it.

have a nice day!