Maybe most people already have a job which they spend time and get money in return, so why would they spend even more of their free time in pursuit of a little bit more money? Life is more than money anyways
People are naturally greedy. Plenty of developers sacrifice their relationships, health, and appearance for high comp packages.
Most people have the attitude towards crypto that it is an over-hyped technology that is just sucking-up people's time and attention and so the best thing to do is to ignore it and hope it goes away as soon as possible so as to free-up people's time and attention towards more worthwhile things.