Web application vulnerability scanners are big businesses. A quick research into alternatives will show you that there are literally hundreds of open source and commercial scanners, and all of them offer varying coverage of the vuln space as well as functions that extend into the different phases of the Pen Test Kill chain. As is the case with any trend in security, this explosion in the market is a symptom of something else entirely: web applications are, by their very nature, easy to access and popular for hackers to exploit. The payoff for a successful breach or compromise is massive.
Most major companies involved in cyber security solutions publish annual reports that summarize the past year's events and make predictions of the expected trends that will shape the business in the years to come. Verizon, Dell, Cisco, FireEye, Symantec...