I suspect the 11% is probably a hard to get target too. I don't know how much Lego expanded since the 80s too and you run into the risk of discontinued sets not staying that way.
Also, the past might not be a good reflection on the future... The study was also done by collectors of Lego sets too.
And the study focused on limited editions most likely, and those are hard to get in the first.
The main source of that article is nypost, and nypost is just a clickbait newspaper.
Now, since they mentioned a set like the Millennium Falcon, one can easily check on it.
It was around 500$ when it started in 2007 and the last offer on brickcatalog was around 1,899.79 , a bit short of 2200 you could have made with the 11% but still in range. But it wasn't sold!
Just as head up, on eBay there is a guy demanding 4500e for it.
All those lost Legos that my brother tried to eat or stuff in his nose would be crying right now. I was checking the price of Legos for Christmas, the titanic one, apparently it's 500$, which made me extremely anxious regarding how fast the prices are rising and would we be able to keep up with the inflation??
You should have bought it when you had the chance, it's out of stock with the last price of 599 Euros here.
You missed doing a 36% profit in less than a month.
Now joking aside, some sets do really gain value, especially sets that resurface with movies or other events, star wars is the example, although lately they've done so many it probably has diluted the market. So you don't need to only buy them but buy the right ones, damn, like investing in shitcoins.
Can't wait till lego starts doing NFTs and suddenly half of the critics start praising lego sets.