I agree with Mary. I was approached last summer by someone wanting to pay commission only for marketing work. It was too much of a risk for me, since I still have bills to pay. I knew that I was accountable to myself, but I wasn't sure if they'd do everything they said they would do to make the project work. Apparently this company is doing quite well now, and I'm missing out. But I had to go with my comfort level.
Maybe after your meeting you'll have more information on which you can make an informed decision, and we can help you.