The court says that Lucy "insists, however, that it lacks the elements of a contract. She says that the plaintiff does not bind himself to anything."
We can expand this argument
1.All Lucy got in exchange for her promise that Wood would be the exclusive marketer was Wood's promise that he would be the exclusive marketer and pay half the profits. But he did not promise to do anything.
2.Lucy did not give her promise to get Wood's "do nothing" promise.
3.Therefore, there is no consideration for Lucy's promise.