I read the piece about the Forever stamps. Not a bad idea if you mail things. But why pay face value? Stamp collectors often purchase large quantities of stamps looking for a one or two particular stamp. Usually they sell off the remaining stamps at less than face value. Also, many stamp collectors invested in full sheets of Stamps issued in the 1950s and 1960s, thinking full sheets would appreciate in value (They didn’t.) These sheets and other bulk postage can often be found selling at 50% to 90% of face value on eBay.
So, if your readers need a boatload of stamps, and send regular mail often, this may save them some money. Also, I think this is obvious, but remember to factor in shipping as part of total cost. – Bill