When I've bought a template I don't want to spend hours trying to delete all the items and collections. Not to mention all the bindings and references that actually make it impossible to do this task.
I simply had to give up on the one I'm currently working on, so clients will now see a bunch of collections not related to their site.
Update: Had to find all dynamic content throughout the template pages to be able to remove it. Really feel there's some way this should've been a bit easier.