Well, without it becomes a giant wildcard. Imagine flying someone in from the other side of the planet and providing accomodations - suddenly it ends up being less of a helping hand to make the movie and basically a very expensive premiere ticket and accomodation. All kickstarter rewards basically have to give you somwething back, but still make the project money, and usually the higher-tier rewards give you less monetary rewards and more feel good / influential rewards.
