Bitcoin could be at $40,000 at the end of 2018. It easily could," Michael Novogratz says on CNBC's "Fast Money
Ethereum, which I think just touched $500 or is getting close, could be triple where it is as well," adds Novogratz, formerly a macro hedge fund manager at Fortress Investment Group.
One need not to be optimistic about because if your prediction didn't come to pass so many people who has invested as a result of your prediction will be misled and probably loose huge amount of money as a result one speculation. I don't think you get your information right because ethereum market value far above $500 even as at the time you open this thread.
Just a very small advice, do not invest over the information that someone in a forum is giving you, you do not know why the person that is giving you an advice is doing it, maybe that person has an interest that a particular coin does well and it is trying to attract investors or maybe he has just bad intentions and wants to see people lose their money, so before investing always verify all the information you receive before making any choice.