Ethereum goes beyond being a simple currency, it's a whole platform, an ecosystem. It's a technology which has potential to change the world like the Internet did.
Just have a look at how many interesting project are being created on Ethereum platform and imagine what else can be done.
This should justify pretty well the investment in ETH :)
RE: The FLIPPENING is Getting Closer & Closer - Ethereum to Overtake Bitcoin!! - News!!