How exactly do altcoins gain value? There are so many altcoins out there and honestly you can see connection among these in terms of the drop and rise of price.
All coins are based on the blokchain system, and as we see the dependence with the change of bitcoin, the founder of this system, most of the altcoins also change. Some of course have already become self-sustaining and are not subject to such changes, it is to such coins and you need to bet.