I have four or five deals I have posted in the last week, and compared to deals I have posted previously - there was a disproportionate number of almost pointless replies - well - enough to make me notice.
Looking further - virtually all these replies came from new members - ones who have joined this month.
Suddenly the penny dropped. Its to qualify for the new competition thing!
Sad sad sad.
I was pointing this at multiple IDs rather than thinking it was attracting in new members.