Not all coins are useless. However, the problem is that people expect prices to increase continuously. A coin rising so prices should not rise. Then the prices thought the project is called the worst. This situation needs to be solved.
Well an investor would always expect profit and coin price to go up. Only those traders are the ones that will try to pull the price down to accumulate more of the coins. Its what they always do to profit. The more people who trade the coin, it means its has demands and shall the price go up. It doesn't necessarily have the use case but its features can help. XMR for instance doesn't ' have use case but its anon features gets demand.