Make a bounty based on stake/post is really worst thing. Just take a look how many of your participants spamming on this forum to get highest stakes with their spam post (Many user even made more than 1.5k posts ONLY during campaign)
I learned more than 100 posts, a member of the bounty who wrote more than 2000 posts. My friend, I want to say that he is a great boy and in one I did not find spam, he wrote about 30 messages a day throughout the bounty. If such rules were given initially, then he will fairly receive his reward!
Well the rules say the following:
5: Posts must be constructive, on topic and high quality. Off-topic & spam posts will not count, also we reserve the right to reject any post without giving a reason.