You get to choose your clients.
Hotel, etc. expenses are directly billed.
You actually receive that high hourly rate clients are paying for you.
No dress code.
Close client interaction at all times.
You are working nights anyway.
Finally a way to fit exercise into a tight schedule.
Continual feedback - every two hours or so.
Not tied down working with a team (unless you want to be).
Either way you are still getting screwed.