That is just the whole fact, investing in altcoins which might be viewed as potential coins might be a very risky thing to do because they can not be trusted as a result of self-centred team. In the case of Ethereum, considering the fact it is the second top Cryptocurrency, I think there is not a bad time to invest; a good example is the one you highlighted wherein somepeople bought at a lower price in January and I believe most people might have thought it's too risky to buy then, but now look at the price. So I think, when someone want to take such decisions in going after a coin that has grown quite much for days, then it is better doing such with major coins.