GridGain for Elastic Computing

I attended a seminar on GridGaid for interfacing with Amazon Cloud. It was cool. The tool interfaces with the Cloud and performs,
Auto Scaling - Scale up/down based on the computing load
Data Grid - Split the storage across node

But it doesn't come free of cost. The enterprise edition of GridGain has these great feature and its pay per usage (On top of what we pay for Amazon). I asked the question about how to justify the pricing for the usage of GridGain on top of Cloud cost. The presenter explained that the open source version has lot more features like automatic on/off cloud, compute on the cloud etc., But the enterprise edition has more features which will be required by large organization that requires faster computing and data load power.