If the coin is rubbish, then I'll never invest in a coin for $ 0.1. There are a lot of coins under $ 1. But you need to choose the coin that has high potential and can grow in the future
Do you have your own method how to understand if the coin is rubbish or if it is worth your attention? As for altcoins under a dollar, many of them are very good. They have the better potential than expensive alts.