"The number of successful people working as freelance photographers in America today, is less than the number of guys playing in the NBA." - Kenneth Jarecke (via APE)

And in the comments I find this from a reader : "I'll be honest - I work professionally but I need to supplement my income by doing other things."

How true. You don't know how many photographers I've assisted over the years who have other jobs to make ends meet. Seriously.

Taken out of context the quote above does seem ridiculous but read the link.