Wars, pestilence, famine, gunpowder...
There are many things that can unfold in this world, things that simply can't be predicted.
We live in an unstable world.
The dollar could drop so heavily that we'll be lucky to afford gunpowder on a good day... People will kill others over sencha as they have killed people over sneakers.
But what if... just what if... you could put your tea in cryogenics, effectively freezing it, so that when you took it out, even several decades later, it would be as fresh as the day it was picked. If you did this, for example, before a possible severe drop in the dollar that led to sencha costing 1,000 USD per 100 grams you'd be rich in tea.
Would you do it? And if so, would you purchase a life-time supply of tea in a single year? A single month?
The ball is in your court.
P.S. - The rumor that I have 3,000 dollars in yen stockpiled is fact