Not really a bad idea, how much you are going to invest if it is a huge amount then diversify into different coins even if it is in thousands that is the only way of reducing the capital loss risk.And also investing on ethereum like coin don't expect the profits in months probably it will take years to give returns to you if you are attracted towards ethereum due to the recent spike in ethereum and wanted to invest only in short term then I will say better don't invest at all.