It's NOT an investment. It's a developer resource, e.g. if you're a programmer or company looking to build an ethereum project. If you don't even know how to buy it (i.e. you haven't a clue what ethereum is, that they have 1 website with all their information and their fundraiser) you shouldn't buy it because you're probably not a developer.
In the same way you wouldn't buy a developer-license for the new Google Android version, or a developer-license for Google Glass. Ethers are the de facto dev-license, they're what's necessary to actually utilize the ethereum network. You don't need one.
I love bitcoin and crypto can be a great investment, but ethereum isn't it. And I'm quoting the people trying to sell you this thing. They've said themselves it's not an investment.