The true value of something is what the buyer can sell it for right after he buys it.
I just made that up.
I wonder if "forever" really means what it says, or will shadyness by the PO happen when the price to mail a letter reaches $5+. Then we'll have an unexpected "for security reasons" demonetization of forever stamps.
I guess over time the current supply will dry up (except for the chinese knockoffs), then we'll have $5 forever stamps "forever".
Just for fun,