The price of cryptocurrencies basically follows the rules of demand and supply. As the coin becomes scares it becomes more valuable and hence the price increases. One common mistake most investors do is that, once they see the price of a coin is going down, they hastily dump what they also holding which increases the supply more than the demand and further reduces the value of that particular coin. Later we try to put the blame on the team that they are not managing the project well. Let's help sustain our coins by avoiding panic selling. Its a collaborative effort.
Yes, I agree with the statement that the price of crypto currency is determined by demand and supply. It's natural for investors to sell coins they hold when prices fall because they are afraid of losing. However, this is the reason for the decline in prices. In fact, the team will certainly try to stabilize the market, but it will certainly be difficult if many investors release their coins.