My stash isn't huge, but definitely big enough for me. I'm personally glad I have it, because I "shop" from it all the time. Most has been acquired through scrap bags at thrift stores or clearance at Walmart, so I have a lot of odds and ends. I love finding "that perfect" scrap for a block. It feels so nice that I have it and didn't need to buy a specific piece.
I have not been thrift store splurging in a while, which is probably good. I've been able to sew up some of my stash, while saving money. It's an investment.
I'm not yet 30 years old, so I'm not even worrying about my kids cleaning up after me. I might finish everything, but probably not!
I don't regret my stash at all.