Atlassian product user base details

I have a few ideas around a variety of Atlassian products that I would like to build and publish and monetize on the marketplace. Does Atlassian publish any metrics on the usage / install base of their various products? For example, how many companies are using Ops Genie and JIRA Service Desk? I ask these question because I am not sure if I should focus on building my solution for PagerDuty and Service Now or if I should take my chances with the Atlassian Platform.

Having some marketing numbers would be incredibly useful.