It think its evidenced by all the "retirements" that occur in this business, both sides. Someone "retires" and invariably they are back, often times within weeks or months. The lure of the money/pussy/variety/relationships is too great for most people to simply walk away forever. Its called addiction, and I am totally OK with that!
Thats why the line in Hotel California came to my mind reading this thread
"You can checkout any time you like,
But you can never leave"
Excellent thread and topic, EA!