2 to 3, in maximum, I suppose. 10% of weekly post quota in Spam mega thread is enough. If one participant has big love in those threads, s(he) is free to posts any posts in those thread for personal favorite. But remember to make more posts outside those places to satisfy weekly post requirements of the campaign.
I like this idea, but how can we know if the mega threads were posting are spam threads if the topic is good. I agree with the additional post if necessary to compliment with the signature requirement. Or also we can try the suggestion by Questat. But depends on bestchange if implementing pay per post will suit their time to check specifically.
Maybe BC can change the minimum to 10 and the maximum is 25 posts (paid posts), so users who are busy outside the forum does not need to do burst posting just to reach the minimum requirement.
Will support bestchange with this, If they found a system flawed then there must be reason for this. Tranthidung explained well details on this, and the only choice for us is to improved on posting on good sections and avoid spam threads and helped company for the ads to be more visible.