[jopsen]

I have always archived my documents by throwing them in an unsorted black box.

If someone really need me to retrieve an old document. It'll take forever to find, but why would I want to pay sorting costs upfront?

[copperx]

Because you often need documents on stressful occasions such after the death of a family member, after an accident, after losing your job, after an IRS audit. You really want to be going over n documents with the possibility of missing one or more during such times?

[outsideoflife]

Because some businesses generate very large volumes of documents that have to be stored