Will you give me 100 bitcoins today if I promise to give you 100 bitcoins next year? Of course not -- even if you 100% trust me, you're still giving up the opportunity value of being able to spend those bitcoins within the next year should you choose to do so. There's no reason you should give that up in exchange for nothing. If you hold your bitcoins, that's exactly what you're doing.
I don't understand what you're saying. Your argument seems to imply the exact opposite of your conclusion. You seem to be saying that if you want to be able to use your money at any time, you should let someone else take care of it. But actually, when you do that, you are risking losing access to your money, because they may run off with it, or do something else irresponsible with it and lose it. And you also seem to argue that this is why you shouldn't hold on to your money... because then you can't use it when you want. But exactly the opposite of this is true. It is only when you have it that you can use it when you want.
The opportunity value is decreased, not increased, by storing money in a bank.
no no, what he said is that having your money in the bank gives you so much more opportunity.
the part when he said opportunity value, he means you get the full extent of what it can do by being able to use it at many more places.
for instance, you can't buy a videocard from newegg if the cash is in a safe in your house or even sitting in your pocket.
It's the same idea if your bitcoins only exist on a computer that is turned off, there is zero opportunity to actually use them. It really was a very insightful thought he shared.
If your computer is off, you can't use bitcoin banks either. Sounds to me like his thought would have been insightful for dollars, but not for bitcoins.