Singapore Hosptial Means Testing

Recently, Singapore's Health Ministry announced a need for means testing.

http://www.channelnewsasia.com/stories/singaporelocalnews/view/321367/1/.html

But what exactly is means testing? From Wikipedia, means test refers to an investigative process undertaken to determine whether or not an individual or family is eligible to receive certain types of benefits from the government. The "test" can consist of quantifying the party's income, or assets, or a combination of both.

Is there really a need for means testing? In my opinion, I think this system may not be useful since the rich ones will live in a higher class ward anyway. So why bother to perform means testing?