I offer 0.025 btc for one account. I think its reasonable for a member account, tell me if you are ok with my offer
If I understand it correctly they're not Member accounts but Newbie accounts. Op says they only have ten posts so that's probably 10 posts in 10 different periods and you will need to make 110 posts to get to Full level.
I think OP has got something wrong.
The potential activity should be a multiple of 14.
I think it is 126(9 periods)