Simply put. I agree,

More detail answer:
Bitcoin is like a rembrandt painting. People buy it because the price have gone up so far. If knowbody believs in this anymore it will crash... (and you have some digital coins that do noting for you..

on the other hand. If you buy lets say sahres in an insurance company, that pays lets say 10% dividend p.a. If nobody whants the shares anymore you still get 10% cash per year ... (the company is buying back it's stock and you get a proportial higher stake in the company. or it increases it's dividend .. ) all kind of god things can happen to you. because the underlying asset produces a cashflow. Bitcoin does not thats the point