Just recently, they are planning to add 10 more participants for Sr and Full member with a rate of BTC 0.0001 per 5 posts which I think a typo error.
I guess it's not an error typo, You can see the next statement from the campaign manager (StaveStake)
You make 5 posts and you get 0.0001 BTC
You make another 5 posts and you get another 0.0001 BTC
This repeats for every 5 posts throughout the week. I'm not sure why anyone is confused.
Just have low rate payment for Full member and Sr. Member, and everyone can look for another signature campaign when the payment is not as desired.