I think its price will raise in future such as bitcoin which provide you profit in future so invest in them by thinking of future.if you invest in a better altcoin such as centra coin or zcoin it would be very beneficial to you or everyone because it will give you profit in future because it is very stable coin.
Are there other ideas how to decide which coins have no value and we should not even worry about them? I agree with you that most of them do not have quality. The question is, how can you know if it's going to be a good coin or not?