AFAIC, building a stash is like building an art collection or a stamp collection. It makes me happy to see all the kits I love.
My brother-in-law has about 5,000 classical music CDs, he tells me that "simply looking at his CD collection" makes hime happy. A friend has about 800 movie DVDs, he says the same thing.
I'll stop buying kits when I have 100 kits in my stash