Again seeing this idea, lol. And it's still just as pointless.
Basically all that it would do is hold your gold for you with an extra password page.
Entering your password won't stop too many users, therefore: pointless feature.
Also, if you want to store your gold and earn interest, look into hoarding.
It's something I do; buy items as an investment, wait, sell. :3
I say we make a bank, let the poor saps put there hard earned gold in but have a small very small notice on the bottom of the page. The notice will read "lulz you just put gold in this bank, too bad this isn't a bank" Gaia get's gold back into the system, users all rage. Great April fools joke c;