<prompt> Human: If you guys didnt know, machine guns are legal to purchase and own in the United States with some restrictions. But they have been banned from new manufacture since 1986 and because of that, the amount of civilian legal transferable machine guns is small. These machine guns that once were hundreds of dollars are now worth tens of thousands. I was thinking that later on I might purchase one legally and let its value go up over time. I am not sure if this has been discussed here, but I wanted to know what you guys thought about this. If you are non-American, your opinion is just as useful because you have a broader, outside perspective. If you are intrigued about this, this page does a decent job of explaining the NFA and has links with the weapons.  <response>: Like all really speculative investments e.g. collectibles, only invest with what you can afford to lose. And before that, I would make sure you had your personal finance basics settled. That means getting your emergency funds saved up and retirement funds stashed away. Only then would I consider doing some crazy stuff, and even then, only a small percentage of my assets. 