It is worth buying the coins but that is only if the coin is good. Some people usually say that low volume coins are more likely to go up in price but in reality it all boils down to the team behind it and the kind of community of investors that the coins has. Make sure you do research into the coin before you buy it though, can't be ttoo safe in this present market.
It is simple low volume tokens is more scarce so the demand and supply will only revolve around a small number of tokens circulating the market and I'm pretty sure most of the people who have it will try to hold it as much as they can to get its price rise(if the project or the token really has the capability to be used IRL).