So I'm certain, as artists, we've all felt these situations, where at first you're like "sweet! I get to be apart of this awesome thing!" or "Great! Someone likes my work enough to want to get a lot of it!" or something similarly unrelated. And then not very far into the future you are full of "sour" feelings when you start to get unreasonable requests. Deadlines get a couple weeks shaved off, or you're asked to do a project without payment because "It would look good on your portfolio" or they think "you just love what you are doing so much that you need an opportunity to have an open canvas" or whatever weird thing that has been made up because people seem to think art is free. In the event you don't know what I'm talking about, which I doubt, just peruse around the craigslist want ads for art/media/design.