Not really. Each coin is created with its own purpose and function. They are not completely worthless. But the sad fact is that many new coins have a very low value compared to its ICO prices. Causing heavy losses to investors...
it's because of the inability of developers to manage their markets. some of the token holders would want to sell their tokens. and when the buyer is a little the price will decrease. the task of the team is to grow demand in the market for their tokens.