Yes, it's that.. you can easily find someone with regrets of having thrown something away which actually turned out to be useful later (I have lots of those), but it's very rare to find someone saying "I really regret I didn't throw that away" (unless it's e.g. some chemical stuff which went bad and created a mess). So, better safe than sorry.. I've hoarded a lot of stuff, but I've also realized there's not enough time left in life to use everything, even though I only hoard stuff I'm actually interested in. So I dump stuff. And sometimes I regret it - where's that nice piece of wood I had stashed away, now suddenly it would have been useful.. so I go and buy, instead. And so on.