I get stubborn and dig in when people tell me I can't do something and I think I can. It goes back to my childhood when I had problems in school because I have a learning disability.
In Irish law, busking is considered vagrancy - you can be arrested for it. It's risky asking people for money in public. So it's not like it's a high-art job. And people who do it as a high-art job make very little money.