It is my opinion, what about you?
When scalpers trade, they want to profit off the changes in a security's bid-ask spread. That's the difference between the price a broker will buy a security from a trader (the bid) and the price the broker will sell it (the ask). So, therefore, they're looking for a wider spread.
But in normal circumstances, trading is fairly consistent and can allow for steady profits. That's because the spread between the bid and ask is also steady, as supply and demand for securities is balanced.Give your feedback too.