first of all you can remove and send to other account or people 30 coins so its will stay 20 coins and than sell to me.
second,The market value for 1000 stellar is 2.2$,so 20 stellar worth 0.044$ but you cant do with that something.
i offer 0.2$ per each account its almost 5 times more than the worth it.
and what about the invite in that account?
u can receive 3500 str if u invite sum other guys thats worth $6.5