Badges get more and more useful and exciting as one's community grows.
It also offers continuous opportunity for members to learn how to engage better and enroll in other programs if they're interested.
So... when a member clicks on someone's badge because they're wondering what it means, it should open a new tab / info page that explains the badge and gives any links as needed to other pages, e.g. a sales page to enroll in something to earn that badge.