I invested in ETH at $2, yes the price was cheap but this was prior to the ICO craze and I was also unemployed so the amount I purchased was minimal. The issue I have with ETH is the product ecosystem. Currently other than ICO investment contracts I have yet to see a main stream dapp or use of smart contracts by major players. Your bet is as good as mine. The momentum is there the only way I see prices skyrocket is if products and real use case starts to gain momentum.