Aggregator sites like coinmarketcap and livecoinwatch often show trends of greatest gainers/losers of the day/week/month/year. However, coins with almost dead marketcaps are prone to manipulation.
Why don't these sites remove such coins?
I think they are not aware about the latest update regarding those dead coins. It will need a lot of time to filter and delist those dead coins. This is why CMC will not do that and i believe that was the main reason.
There were hundreds dead coins and it will increase more and more.