I have experienced it. I did hold my coins until the coins that I have drops to about a ten times below the ICO price. It was really not good to see and many got disappointed and they are yelling that these are scams, yet I was not actually considering them as one as I know their hard work. The team did their best but the market was just not so favorable for now. On the other hand there are also coins that have increased in value which I think succeeds in promoting their coins. So I think it is a matter of researching and analyzing when to sell your coins. But I would suggest if you really need it then sell it, if not so important then help the team by holding it.