Interesting to see this thread.
I actually sent a message to the SPAM moderators asking for their help on this exact issue.
It was getting tiring seeing all the people coming in with one post and wanting referrals without taking the time to even understand the rules of the CONGA.... not like you could miss them, established members have done a great job detailing them.
I have a feeling most of these people will never become "productive" members of the community... no travel interest. They are only here for the freebie.
So, I think most will go away when they see that they have to get lots of posts sowhere else.
So, I would highly recommend the 100 post requirement....
William