There is no cap on the number of ideas posts we can have, and thus no reason to limit the ideas people provide. In the end, it's going to be a coder, with a good understanding of the game and the mechanics and what we are looking from our gameplay that makes the decision on if we implement a feature or not.
The BGBB is for discussion, and the ideas threads are for people to make the case why a feature deserves (or doesn't deserve) to be in the game so that coders can review the threads and see if anything they see sounds like it fits with our goals for the game.
If literally no one responds to an idea, the coder doesn't say 'well no one likes that idea' as some ideas speak for themselves. If everyone responds '+1' that doesn't mean the coder says 'well i better implement that'. We do our own critical thinking on if a feature should be added. Sometimes the discussion on the posts helps us gather more information and consider the angles without having to put as much thought into it, but that doesn't mean we -wouldn't- do that critical thinking if you hadn't posted your thoughts.