I am serious about working in the crypto-currency sphere, so I always keep track of changes in information, the site is almost always open in the browser tab, and not only it, there are other useful
For traders/investors who are in a daily trade activities, checking CMC is really needed to follow the current flow of the coins they are supporting
they needed to know about any impacting news and check if there's already an opportunity to either buy or sell the coins that they have, right now
I'm not dealing too much with trading so I'm not often to use this site.