That's true for anything though. If I convince you to get into model trains it's not because it will significantly raise the after-market value of my current (rolling) stock.
Now if you convince me to get into collectible model trains, say pre-war Lionel models, the supply of which is fixed, that will raise the after-market value of your pre-war Lionel models. Whether or not that increase is significant depends on a lot of things of course.
Ponzi scheme was not what I wanted to say. Pyramid scheme is what I wanted to say.