Many investors see Ethereum as a coin in the long term. It also means that people will buy this currency and will not sell. It is very good for Ethereum
I think that's pretty true - it's difficult to tell how many people are going to sit on it and how many people will use it as a functional currency. Quite a few tech companies are adopting it to use with their internal marketplaces/ecosystems so there's a function that is driving ETH along with the interest from investors.