You can't find a Full Member for sale under 0.15 unless you are extremely lucky, only $15 is a steal for a Full Member (soon to be Senior).
this account has activity of 142 and we need 240 activity to become a senior member
then how you claim this will become senior member soon when it need 100 activity for that
His activity level equals the number of posts that it has, so it is potentially possible that you could cause the rank of the account to increase just by making enough posts. Even if you are able to achieve this the account will probably not have much value because of the fact it is associated with CandyStripes who tried to extort some guy in the currency exchange section