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?
It takes time, as far as I can remember, there is a limit of demand and a volume of coins on which this coin is placed on such sites. Most likely while it is they are kept.