Posts must be more than 75 characters.
Posts must be more than 3 sentences
There are plenty of posts that are more high quality than those with 100 characters/10+ sentences. Oftentimes you'll see shitposters try and cover themselves up by rambling on over... and over... and over...
Finally, users should NOT be paid based on rank, but on loyalty to the campaign.
Example: a user should have their payment increase by, say, 5% per payment.
So a mediocre poster barely passing on through each period could be paid more than someone actually caring about what they're posting? Plus, it's discouraging campaigns to continue on for a while because those like Bit-X would be paying some people 200%+ the normal payment.