~snip
You listed RRMine as paying $25 for Sr Members, but it has no Sr. member slot and the $25 payment is for full members.
What a weird payout structure. I've updated the OP. Thanks NotATether and ralle14.
weird that ralle14 missed too. 'twas a good catch NotATether!
*a wild guess**
Maybe it is upon Hhampuz' observation that:
Sr. Members post quality < Full Members post quality.
or
Sr. Members spamming rate > Full members spamming rate.
Sent him an inquiry because Bitamp also have the same payout structure.
thanks for the update Mitchell