Odaiba was built on reclaimed land (i.e. junk) and wants to be modern, exciting and popular, just like the rest of the modern developments that have no hope of making any money for centuries. Roppongi Hills and Shiodome come to mind.
Anyway, Odaiba isn't some small development, Odaiba is a domain. It has the driverless Yurikamome monorail (more impressive than the Docklands Light Railway in London). It has a fake beach. It has... stuff.
Shown above is the large shopping mall called Aqua City next door to the oddity known as the Fuji Television building.