It is always good to buy to coin below 1$ but the thing is we have to research about the coin which we are investing because if you invest in fake project definitely you will be in loos. So always try to do research before investing.
Someone said very well that every penny counts and contribute to your wealth or economy so do not be so careless and try to use and get your money as much as you can but for good reasons which benefit you. In the crypto market you can start with little amount but it will benefit you if you treat it well according to the rules and guiding principles so there is nothing to worry about.