Same as was gambling
Many in here seem to have been caught up in it, spending far too much of their money on something. Partially to get the dopamine rush of buying more coin, and partially to satisfy their gambling lust hoping to score big.
It is no different than the people gambling their savings away on the roulette. Right now we are at the point where they have entered the casino and have been lucky, so they are up more money than they came. But instead of quitting while they are ahead they genuinely believe that their luck continues.
In the end it ends bad.
Addiction to heroin or drugs will end badly. Bitcoin is not an asset to be bad like those. This is a currency in the form of crypto, with limited stock yes. It's true, that the available stock for mined will be exhausted in time, but that doesn't mean it will be the end of Bitcoin itself.
Total Bitcoin is available as much as 21 billions, will later be spun in the market and can be traded for both trading and fellow users.
This is certainly different from your pessimistic.