If your a trader this is the number one source of fundamentals. You need to understand all the current events that affects your investment. You need to read a lot to understand the market sentiments. Any development positive or negative are important to be consider.
Being a professional trader means that the person has to be up to date on the coin news.
If they aren't up to date on the coin then they will be missing out on the timing to invest at the right moment. Bitcoin is a coin that shows what I am writing about, the price goes up and also down with the news and other events that revolve around BTC. Altcoins can also have whales bring the price down or up then they could post something on the message boards, Twitter, YouTube, etc.
So you should stay informed on what is going on if you are trying to trade coins or just trying to store coins.