[PakG1]

maybe there aren't many advantages for a city like Tokyo or London

For a country that has endured the world's only recent nuclear disaster and has experienced massive economic stagnation for quite some time, I imagine that the Olympics could present a similar opportunity for building pride and galvanizing the country. Will the investment pay off? Who knows? China's investment isn't paying off in the financial sense that a lot of the Olympic buildings built have no real post-Olympic use. But if we are considering the pride factor alone here, then I imagine Tokyo will have a similar boost.