Low volume gives you a hell of a spread which in turn means costs to you. Sometimes it can be attractive if you know something others don't. You can place your orders relatively low as those who want to dump will go for it no matter how much they crash the price. Usually though it is bad as you can't get rid of the coins either when you want to.
This is the dilemma when you buy a low volume coin. The spread of buy and sell order is quite wide and also, the trading activity is slow. It is only good to invest if you believe that the coin has future, but if the developments are slow and it seems the dev team is not doing anything. Don't risk your hard-earned money into this kind of venture. You will end up losing all your money as the likelihood that it will be abandoned is high. Better look for alts that have active trading activity. Learned my lesson also on this kind of coin.
Chances are very low anyway for some low volume coin to explode. In the early days that was really possible because even smaller guys could move the market and raise awareness through a couple of buys that pushed the price up. Today we have so many exchanges that contribute to price and value detection.
It is safe to assume that a coin which seems dead also is dead.
) , and when a person has bonus money or residual money that does not affect the economy and emotions when he loses it, it is worth trying to buy coins at low prices and small volume. This could potentially earn us huge profits in the most unexpected times, and won't make us poor due to the allocation of unused money that went into buying these strange coins.