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 agree because this would give us a better point of view of what is the market capitalization of only those active coins. Anyway, if ever they won't delist it then it would just be alright because the most important is bitcoin anyway since it is the benchmark of crypto prices. It has a big influence on where the market goes. The coins that almost has no volume are the coins that are used most often to pump and dump groups because they can easily pump it so as much as possible, avoid those coins.