I realize that these stories are a metaphor for something else, but ...

"And no one puts new wine in old wineskins. The old skins would burst from the pressure, spilling the wine and ruining the skins. New wine must be stored in new wineskins. That way both the wine and the wineskins are preserved." Matthew 9:17, NLT

If you don't put new wine in old wineskins, what do you put in old wineskins?

Do they just get thrown away when the old wine is gone?

If so, why should you care if they get ruined?

"A rich man had a fertile farm that produced fine crops. In fact, his barns were full to overflowing. So he said, 'I know! I'll tear down my barns and build bigger ones. Then I'll have room enough to store everything'." Luke 12:16-18, NLT

Who tears down a perfectly good barn to build a bigger barn?

Why not just build a second barn?

How did this guy get so rich making such poor business decisions?