Beyne can't cancel the stake anymore than you can cancel the lease on a car. An important point is whether all of the backers agreed to the termination of the stake before he played the Main Event, or if some people were still holding him to his former agreement. As China points out, the prudent thing to do would be to agree to cancel it and come to a new agreement on payments, but just because it's prudent doesn't mean people have to accept this.