It really depends on the coins. There are coins that have high potential to be in demand in the future that would be a giod investment. It would be good to evaluate its current value for the past months. See how did that coin fair in the market. If you see relevant increase then that is a good sign.
i agree, not all low value coin under $1 is at a good to buy. Check every coins fundamental and those who had a good reputation, project with a high ATH before and now had a low price under $1 is absolutely worth to buy and sell when bull run comes.