Waiters like to work in pricey restaurants serving wealthy patrons because they are able to pay for high class service. That's also why you see so many professionals in the banking industry: it pays to work for people with money. Xignite took note of this and decided to become the Maitre'd of information to the financial industry. With more than 3.5 Billion calls per month to its Xignite APIs, it is doing a fine job of it, as well.
The University of Michigan Medical School created the Vaccine Investigation and Online Information Network (VIOLIN) because the vaccine research field lacked a web-based central repository where researchers could easily retrieve the vast amount of data underlying hundreds of years of research. Not only has VIOLIN provided the online database, the database is easily accessible via the VIOLIN API.