Expo should continue because having Expo, everybody can see international stuff at one place. At expo, we can also share many stuff like more food and technology. Expo also brings more population and pushes crisis out. This year, Expo is hosted at Milan, but many protest does not want expo at milan. Even though Milan used a lot of money building the buildings, Italy will gain a lot more at expo as soon as Expo get full of people. Just like the shanghai Expo, china earned a lot of money by opening Expo. Expo is a place where many people come together and workd hard to make an international exhibition. Expo 2015, feeding the world, energy for life.
I myself have been to Expo in 2012 in Yeosu, Korea, and I do not believe they are necessary enough to spend billions of dollars. There are other ways to experience other cultures, especially with modern technology, and Expo is often times detrimental to country's economy. In 2012, South Korean government spent more than 2 trillion KRW to build the facilities, and the account balance after the event was negative 60 billion KRW. Countries that are well known have many visitors, but others have very few, making it difficult to cover the cost of the event. Expos in Italy historically has had relatively small amount of visitors, and thus it is not likely that they will benefit from this event. Therefore, I believe that Expos are not necessary.