Except they did. Countless people have done the calculus and decided that their creativity wasn't going to put food on the table.
I'm not sure the startup angle jives with the artist's.
Most great artists, musicians, writers, theorists, scientists, teachers, and inventors would not need to struggle as much if they would have some money to cover their basic needs. They would just avoid bullshit gigs and do they stuff with a greater focus. And if having $1M in their bank account would stop them doing what they love, then it is quite possible that they didn't love it in the first place.
That is what poor people are told to justify their struggle.