I think I agree with all of @Daniel_Stonier’s points. However, perhaps we should first get people to post here at all before taking measures to deal with an expected flood of posts. 
Also, having a binary release is only one sign that the package is high quality. This rule would exclude such projects as Google Cartographer, which are high quality, have a good test coverage + documentation, but no binary ROS release.
Anyway, I don’t care too much one way or another. We can still change the rule later if it doesn’t work.