BTC is a trip to Vegas, sometimes you win, sometimes you go home with nothing.
People that only hold BTC never prosper, they just die and their coins get lost.
Not really sure what you mean, you're talking about gambling, investing in Bitcoin isn't a gambling, period.
Even Bitcoin price will dump 80% from the current ATH, you still have 20% in USD rate and you could sell it if you want, you're not lost everything.
Many early adopter who mine BTC in the early days are have good life and become a billionaire, the reason why their coins get lost is they think it's worthless so they didn't make any back up. Now when Bitcoin already worth for $20.000/each, many people already back up and tell their family about their private key.