You are ignoring price. Anybody want to form a company to undercut Scott's company by offering a similar services, but say with 2-second updates for 1/4 the cost? (A premium service may be faster. Or, we could leave that niche to Scott.)

And you are ignoring the fact that you don't know the bond/stock market and traders all that well.

I've heard Scott talk about the stuff he's doing. Real-time is a basic need for anything relating to financial markets. A 2-second lag can mean the difference between making hundreds of thousands of dollars, and losing millions sometimes.

And if you don't want to take Scott's word for it, then take my wife's.

She's been working for a large, international media company for better than 4 years now in their division that works with the stock market. The application that she writes for requires real-time updates because it's used by real, live traders in the pits at all of the world's stock exchanges. From the Hang Seng to the Merc, from the NYSE to the Nikkei, her application is used. Why? Because it provides access to the data faster than any of the competitors. People pay thousands of dollars per month to have access to her app and its data coming live from the stock markets around the world. Simply because it provides real-time updates as they happen, thousands of times per second, across thousands of stocks.

I also interviewed with this company a few years ago. At the time, they mentioned how much time their app is contracted to have for outages. If I remember correctly, that number was on the order of 3-12 hours. Per year. Total. Around the world. And, so far as I know, they've kept well under that.
To put it simply, traders cannot get updated data soon enough. They are willing to pay exorbitant amounts of money to shave off fractions of a second from the response time on their data feeds.