http://en.wikipedia.org/wiki/Hollywood_accounting
Summary:
-Studios create a subsidiary corporation for each movie and they almost never show a profit.
-The studios charge the subsidiary service fees for services performed like distribution, which lowers net income to zero or less.
-They do this to avoid taxation and paying royalties to actors.
Quote from wikipedia: "Because of this, net points are sometimes referred to as "monkey points," a term attributed to Eddie Murphy, who is said to have also stated that only a fool would accept net points in his or her contract."
There are many more cases like this involving high profile people including Peter Jackson: