I've had steady work for the past few months and I'm working with other design firms/agencies that seem to have a steady flow of work. They're impressed with what I do and I'm having to turn down work because I don't have time to complete it. I realize that I need to put away a nice amount to be ready for dry periods, but I have that.
To answer your question, I could spend more time freelancing than I can while still at my current job.