The Convent Garden piazza performers get their half an hour allocated and have to work hard to draw an audience and keep them interested until the end. The audience is mostly tourists. The performers generally use a variation of "This is my job. I only get paid by my audiences. If you've enjoyed may act, then I'd suggest that £5 for a half an hour's entertainment is good value".

That seems fair to me. Yes, it's pushy. But I'm sure their experience tells them that they get more money that way than by letting people drift off.

I certainly don't wait until the end of the month and let my employer just drift off. Why should they be any different?