Should magiciens reveal how they perform there illusions?

Behind every magic there is hard work in preparing for it and it needs great concentration and skill doing the trick.The best of the magic lies in how the magician handles the audience without the knowledge of the how about.Revealing the tricks will lose the charm of the magis with a simple words,"poo,is it that much".So,better not reveal any secrets.A secret remains a secret when it is kept a secret.Cheers!