Consider the source. However:

Membership at the country’s largest trade organizations for the jokesters has plunged over the past decade as declining interest, old age and higher standards among employers align against Krusty, Bozo and their crimson-nosed colleagues.

“What’s happening is attrition,” said Clowns of America International President Glen Kohlberger, who added that membership at the Florida-based organization has plummeted since 2006. “The older clowns are passing away.”

It's not only that the older clowns are passing away, according to this article. It's also that "kids these days"—actual quote—just aren't into the profession anymore. “They’re thinking about everything other than clowning," says one (sad?) clown, who makes $300-a-birthday-party in New York.