The Coinmarketcap list will be updated by liquidity pool. Volume can be increased by fake or scam exchange help, for this effect any coin will be listed in the top like Tagz exchange. Not only newbies, we should all buy Bitcoin or top coin to protect our money. I think that's how the market won't be meaningless statistics.
There was an article published in Coindesk a few months back. It dealt with service providers, who would manipulate the trade volumes for less known coins and tokens, for the exchange of a monetary reward. They use bots and fake users to achieve this objective. And in most cases, Coinmarketcap is unable to differentiate between the real and fake volumes for these coins.