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In one of the US discussions here they are chatting about 22 ft gold stamp replicas - and how people invested in these only to discover they have almost no value - years later.
22 feet. Damn, that's HUGE! How do you display those?

Here in the U.S. at least, back in the 70s and 80s, "investment clubs" and other subscription-based collectibles were all the rage. Not only gilt stamps, but first day covers at $5-15 each, colorized coins, NCLT, etc. I've seen countless Franklin Mint and other purveyor "collections" sold for pennies on the dollar compared to original cost.
A few years ago my local stamp dealer offered me a HUGE binder of those gilt stamps on first day covers at 35 cents each. I passed.
The modern incarnation, at least with respect to coins, is all of the trash promoted by the shop-at-home channels (QVC, HSN, ShopHQ, etc.) that have virtually no value. When Obama was elected, there was a spate of colorized U.S. quarter and dollar coins "commemorating" the event, that weren't even decently done with enamel or paint, but rather were just stickers stuck on regular coins, sold at $5-20 per coin/set... targeted specifically at a certain demographic. People who couldn't afford these, bought them as "investments" only to be told a few years later that they might as well spend them in a soda or candy machine, because they are not actually collectible and are eschewed by coin collectors and dealers.
P.T. Barnum is alive and well.