The coins main purpose is to be used in a bounty system to entice pirate groups to upload new content and content not yet added in different quality and subtitles. It is all speculation at this point as it hasn't been added into the site yet but it is supposed to be with the next two weeks.
But you said earlier that purevidz was moderated so why would pirates upload stuff only to have it removed? It sounds like the fork dev has the right idea. Unmoderated and free for all.