Not all altcoins are scams, don't make such judgement because there are so many proven and tested altcoins in the market that is already working. I think that someone just want to sell our coin in low price so that they can gain profit from it. The market is down right now and not the right time to sell the coins. I know that most of the altcoins are scams  but some are good project. You just need to choose the right coin to invest in. Not all altcoins are scam.