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.
“Committing yourself to some kind of job that isn't committed to God is going to bring so much trouble into your life. It's not good and not something I would suggest that someone seek.”