So we have a real mystery here! 
A mystery that can prolly be solved by only you I think that happens more so than members leaving the forum voluntarily because of difficulties making posts for their campaigns or bounties.
Outrightly correct, I mean if users out of their own free will leave the forum cause they can't make posts of at least average/medium quality, then there will be a dearth of shitposts on the forum, they obviously do not leave cause they most times still get selected into one altcoin/ICO bounty whose manager (more often than not) cares less about whatsoever their participants posts per week, and such the circulation of shitposts continues.