A lot of artists give up because it's just too damn hard to go on making art in a culture that by and large does not support its artists. But the people who don't give up are the people who find a way to believe in abundance rather than scarcity.
They've taken into their hearts the idea that there is enough for all of us, that success will manifest itself in different ways for different sorts of artists, that keeping the faith is more important than cashing the check, that being genuinely happy for someone else who got something you hope to get makes you genuinely happier too.