Instead of giving you cash for your "work", they are giving you a campsite that is valued at $xx. You are then responsible for claiming $xx on your taxes as income. I once had a job that provided a salary and free housing with utilities provided. When it came time to settle with Uncle Sam, I had to declare the cost of "rent" and utilities as income. Yea, I ended up PAYING that tax year. Thank goodness I left that job!
Edit: I think Uncle Sam has a double standard there, because when I left that job I went into the military. Not only did I get a salary, but 100% free housing, clothing, food, and medical! I NEVER had to declare all that on my taxes as income! Yea, I know what your thinking ...