We're running those badges as a test and are willing to retract them if necessary. On another site I ran, we did similar badges and it actually increased posting volume without much loss in quality, so we want to see if the same works here.
If it doesn't, then we will probably retract them. But I'm going to run it for a week or so and see what happens.
I do understand all your concerns don't worry! It's something we have thought about.
Also in regards to the person posting a lot in creations, I've just checked it and I don't see a problem with it. People love getting feedback on their games no matter how brief, and the comments left do seem to be constructive and helpful (if a little short).