One of the service providers that really cleans up during the main event are the local massage therapists. Therapists around the Amazon Room charge $2 a minute for a massage. Most of them split their money with their company and get to keep their own tips. In addition to the pay, most therapists have the option of setting their own hours and even days. I spoke with one massage therapist that told me that she wasn't planning on working today until she realized that it was the first day of the Main Event. She decided to work and has been busy since the moment she arrived.
Come in when you want, work as much or as little as you want, and get great pay. That's a dream job if I have ever heard of one.