You'd be surprised, "scaling" a database is something that more and more folks are having to do lately, with the onslaught of mobile apps and facebook apps and web apps, it's just a whole lot easier to create an application that gets hundreds of thousands of users - millions of users.

And more importantly, you can have an application that has hundreds of thousands of users and not really make a ton of money, so you kinda need something that is easy to use because you don't have the capital