Too much supply and insiders who know about development might be dumping but main problem is supply. Crypto is gold, printing too much crypto causes loss in value and when development goes wrong the price comes down fast. With EFL the halvings make it so the coins value increases because it becomes more scarce like gold. There is no development done on a gold coin, the gold coin is made the same way it's been made for 100s of years. Most of the coins in the top 100 have halvings or no PoW at all which create more value.