easy, greed and unit bias, people don't even think about bitcoin because they just think they missed the boat and resent all these people they see as goons that have gotten so rich, while they 'did the right thing' and didn't get rich
coming to bitcoin for a normie is sometimes like admitting everything you did and thought was wrong.
for the shitcoin inclined, it's simpler, they're not looking into btc because they are chasing gains