If the thesis here is true, and stamp investing is one of the best and safest places to put your money, then the Cassandras that scream that the hobby is dying should be ignored.
There will always be those who think that our collectible pieces of paper are child's play, never admitting that they might have value. It might be worth remembering the scenario that played out when Prince George V, a great philatelist, bought the Mauritius 2p blue for £1,450 in 1904. When asked if he was aware that "some damned fool" had purchased the item, his response was "Oh yes...I was that damned fool."
What might that foolish purchase be worth today? An offering of George's Post Office rarity several years ago had a price tag of € 2,000,000. Had The Motley Fool been around in George's day, that would have been an investment they surely would have gotten behind.
(Thanks to Don Shilling at The Stamp Collecting Roundup for the heads-up.)