One of the main reasons is the fact that most of the people buy these tokens buy it to bet with it or use other gambling benefits that could come with holding that token and not to take some profit from the swings, probably most of them don't even check the token price that often, so holders of their tokens are mostly indifferent to price decrease and less likely to sell out of panic.

Actually because of the reasons mentioned these tokens are great buys on the dips as they're less likely to not recover from the lows, because the demand is almost always there because there are some people waiting on the sidelines waiting for those dips to buy the tokens to bet with.