There are people who invested just to make a quick buck, then there are others who are investing in the technology. It may appear that bitcoin has no true value, but that simply is not true. Bitcoin brought us the blockchain, which is now being used for far more than currency. Golem, for instance, will allow you to have the same computing power on your home PC that a million dollar company has. SiaTech (SiaCoin) is making it possible to store as much data on the cloud as you need at a fraction of the cost compared to current cloud providers who are making millions. When you invest in these coins, you are investing in their projects. Some are good, some are worthless. Research goes a long ways with these projects.