There's just something about Frank that everybody wants a piece of. He is so much more than a simple free spirit. There are no boundaries or conventions in his life simply because he has chosen to ignore them. He enjoys his self-provided freedom in an audacious, almost impossible way.
Gerard on the other hand is just human. Although he's blessed with an artist's creative talents and privileges, he is only a marionette and a mass-producer of next to nothing masterpieces. He doesn't know any other reality beyond his safe and cheap world of would-be artistic freedom. Once that bubble bursts he is only human. Human and easily worn out.