def vests_to_bbd(self, vests, post_rshares=0, voting_power=STEEM_100_PERCENT, vote_pct=STEEM_100_PERCENT, not_broadcasted_vote=True, use_stored_data=True):
        """ Obtain the resulting BBD vote value from vests

            :param number vests: vesting shares
            :param int post_rshares: rshares of post which is voted