"Stupid" ideas for pretty good investments

Hello! You hear a lot recently about the so-called alternative investment. At first glance, these are sometimes stupid ideas, but as the saying goes, if something is stupid and it works, it is not stupid: D For example, I have heard about investing in Lego bricks and the analysis carried out by "The Telegraph" shows that In the last 15 years, it was possible to earn more on these blocks than on stocks or on gold, because there is a demand among Lego fans for well-preserved sets that are no longer produced. I've also heard a lot about investment wines. My question - what do you think about such ways of investing? How to estimate the risk, how to predict the future demand for something? Or maybe you have any ideas for "sureties" in such alternative investing?