It doesn't look like viewers have any chance of leaving without a small contribution to reward the performer. A mere "thank you" will do, but never try to sneak silently out of the show without paying, because the performer will pick on the victim till he or she blushes with shame.
"Ladies and gentlemen, if you don't have any money don't go away like that gentlemen with the blue sweater. A thank-you would be really appreciated, sir," an irritated juggler told a member of the audience.
"How much we earn is an irrelevant question," says Graham, "because it really depends on if it rains, if it is a weekend and so on. But let's say the festival makes it worth it to come here from the States."
Not everybody is enthusiastic about the festival, though. Kerry Teakle, who's from Surrey, England, near London, has been living in Edinburgh for the past six years, and she says not all the Scots are happy.
"The real Scots might be happier when everybody goes home," she says. "They complain that the prices go up and that it takes longer to get to town, but I love it. I love the atmosphere and I have theater on my doorstep. It's an event for everybody from 3- to 93-years-old."