All plugins sold through the Atlassian Marketplace follow the same rule: You have to get the user tier that corresponds to your JIRA license. That's in the Pricing FAQ in the marketplace listings.
For plugins sold by the developer directly, it depends. More often than not however, you still have to get the same user tier as the JIRA install. Otherwise, the plugin developer has to include some sort of user management system where you select which users can use the plugin, and it seems obvious that it's not really in their financial interest to do so.
Thanks for signing up for Jira Ops! I’m Matt Ryall, leader for the Jira Ops product team at Atlassian. Since this is a brand new product, we’ll be delivering improvements quickly and sharing updates...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs