Yes, you can still earn cash even not to buy coins or invest. But I am telling, to make it possible, you need to invest your time and effort. You can join in different bounty campaigns. You will get paid by promoting the ICO project through Twitter, Facebook, Reddit, YouTube etc. You can also participate in their signature campaign that allotted with a higher percentage. Be sure to choose the right ICO for you not to get disappoint in the end.