No Answers From Google

Google has announced the end to Google Answers, a service where people could ask questions and subscribed experts would search the net and answer. Adieu to Google Answers However, I am surprised at the blog, which mentions how quickly college grads made the service, what all they learnt and what an experiment it was. However, no reason as to the closure of the service is mentioned. What made Google close this? How successful was the experiment? Were there any attempts made to rejuvenate the service? Questions, questions... answers anyone?