Lola, there's busking and then there's busking that needs to be em, well, censored. I've heard some very good impromptu street performers and always drop something in for their efforts. But there are others I can't get away from and out of audible range soon enough. Most players know if their strains are worthy of public display, but some obviously don't. And I don't mean that folks shouldn't get out there and take one on the chin, that's part of the process of learning to play in public.
I'm fussy about my playing and know/understand my limits so I don't put anything out there that I'm not comfortable with or debatable in terms of quality listening. And yes, we all have our own particular way of doing things, that's why music is personal and unique to each of us. But there is such a thing as not bringing a stale sandwich to a banquet table.