Bootstrapping, playing multiple roles, maintaining relationships, calling up the media and doing your own PR can be a strain.
Small cubicles tend to sound enticing when, for the third or fourth day, you have to work till 3am in the morning. Sleep for 2 or 3hours everyday to keep from going under. None of these make for an attractive business - book - payoff line.
The thrill of the first time, first client, your first big project, first newspaper or radio feature of your work are all enough to keep you doing it. Small cubicle offers will still be made. You are they are missing.