Scalpers will depend more on indicators than news. Scalping is just a waste of time in my opinion. The riskiest trading types are scalping and day trading. Most traders that fall in this categories are losing while swing traders and holders are very patient and make more money from trading. They are also not time consuming like scalping and day trading. If you are using fundamental analysis to trade just as you explained and not trading often, you are not really scalping in my opinion because you do not trade frequently.
I think it depends on a person's knowledge, experience, and understanding of the market. Most scalpers and day traders that I have known were usually in profit because they know when they need to make an entry and when they need to exit, and when they do that, they usually exit with some profit in their hands. So in general, if a scalper or a day trader is good at what they do, they can easily earn more money than those who buy and hold or do swing trading.
A scalper, if knows what he is doing, can earn about 10% to 20% profit on a good day making trades with their capital, now if someone profits 5 days in a week, they wouldn't lose much if they lose two days after that unless their losses are bigger than their gains which generally doesn't happen because experienced traders know how to mitigate the risks.