I think the detailed rule for how to value posts is a secret. it has relation to the adcertisement. and the staff would not tell us it. but, remember this: quality is always much more important than quantity.
i do not know how much u will be paid for a duscussion. My wish is ., u should be really paid for your discussions and the amount (money) is not a matter. It is just an appreciation to your interest and work