We allowed one, as an experiment.
They were two strange fights. Fury was well on top but he was horrendously out of shape and clowned around too much. Chisora was just boring - his opponent is talented but didn't seem to want to be in there while. Chisora couldn't/wouldn't step up to stop him.
Fury's great box office; he's exciting and there's always the chance he'll get caught. Chisora has managed to lose the British title, then European, then world, then to Haye, but still keeps a top ten ranking and tops bills.