Yet another proof that these badges ( promoter, campainer and champion badges) don't work as excpected.
Look this community:
http://discourse.ubuntu.com/users?period=all
( 3790 at this time, the bigger Discourse community I know )
And look how many achieve the promoter, campainer and champion badges...
http://discourse.ubuntu.com/badges
( 0 at this time )
It's easier to make a conclusion with lot of numbers:
My recommendation is "turn off" these badges 