A tenth the price listed2 Apr 2020 14:02
https://www.financialpoise.com/wealthy-still-investing-in-stamps/
Most Stamp Investments Now a Losing Proposition
For the wealthy, the rarest of rare stamps still serve as reliable and sometimes lucrative places to park money. Meanwhile, many stamps have depreciated so quickly they are worth a tenth the price listed in purportedly contemporary guidebooks.
“We are told that postage stamps are a good investment, and this may well be true for very old rare stamps,” British philatelist Paul Sanderson told the Guardian in 2015.
“However, when it comes to less rare stamps we should treat Stanley Gibbons’ catalog values with a large pinch of salt, as in many cases they appear to be absurdly high,” said Sanderson, who was disappointed with the prices he got for his own collection.
Part of the precipitous decline is changing generational interests, with smartphones beating out stamps as entertainment value. Technology has also played a role in deflating prices.