Hey Patrick,
At this time all of the add-ons are wholly separate from each other and are sold as such, so if you want Events Calendar Pro, Eventbrite Tickets, and the Filter Bar, then you’d need to buy three separate licenses.
The way things work is essentially like this: The Events Calendar, the free “core” plugin on wordpress.org, is a fully-featured freestanding events plugin. It provides the events post type and such. Then, all other add-ons, including Events Calendar Pro, just embellish these core events and add more features to them. Each one is independent of each other.
I hope this information helps a bit!
Cheers,
George