The benefit depends on the person using it. Take an investment bank and an algorithmic trading system. Most of your money is made on volume, the faster you reply the more deals you get, the more volume you have, the more money you make. I've seen a lot of presentations at investment banks where every 5 milliseconds they shave off is $50+ million/year more money they make. Keep in mind that most of these companies have gotten to the point where they can do round trip for the whole trade transaction in 5 milliseconds or less. So each millisecond is like a 20% improvement.