I listen to too much Howard Stern, but I have an explanation. Or multiple explanations.
First of all, every writer needs procrastination. It's part of the job description. Any writer worth his salt has to find ways to waste time, and solitaire takes you only so far. (Actually, my solitaire is on-line bridge, a couple of hands at a time, until I drive myself back to my notes and the draft I'm working on.)