отображения Продаж/Покупок:

add_filter('rcl_users','add_count_users_sales',10);
function add_count_users_sales($users){
    global $wpdb,$user_ID;

    if(!$users) return $users;

    $ids = rcl_get_users_ids($users);

    $query = "SELECT COUNT(ID) AS buy_count, user_id AS ID "
            . "FROM ".WP_PREFIX."rmag_files_downloads "
            . "WHERE user_id IN (".implode(',',$ids).") "
            . "GROUP BY user_id";
    
    $buys = $wpdb->get_results($query);

    if($buys)
        $users = rcl_merge_objects($users,$buys,'buy_count'); 
    
    $query = "SELECT COUNT(author_id) AS sale_count, author_id AS ID "
            . "FROM ".WP_PREFIX."rmag_files_downloads "
            . "WHERE author_id IN (".implode(',',$ids).") "
            . "GROUP BY author_id";

    $sales = $wpdb->get_results($query);

    if($sales)
        $users = rcl_merge_objects($users,$sales,'sale_count');

    return $users;
}

function rcl_get_users_ids($users){

    if(!$users) return $users;

    $ids = array();

    foreach($users as $user){
        $ids[] = $user->ID;
    }

    return $ids;
}

function rcl_merge_objects($users,$data,$key){
    foreach($users as $k=>$user){
        foreach($data as $d){
            if(is_array($d)){
                if($d['ID']!=$user->ID) continue;
                $users[$k]->$key = $d[$key];
            }else{
                if($d->ID!=$user->ID) continue;
                $users[$k]->$key = $d->$key;
            }
        }
    }
    return $users;
}

add_action('rcl_user_description','rcl_user_buys_and_sales',20);
function rcl_user_buys_and_sales(){
    global $rcl_user,$rcl_users_set;

    if(!isset($rcl_user->buy_count)) $rcl_user->buy_count = 0;
    if(!isset($rcl_user->sale_count)) $rcl_user->sale_count = 0;
    echo '<span class="filter-data"><i class="fa fa-exchange"></i>Продаж/Покупок: '.$rcl_user->sale_count.'/'.$rcl_user->buy_count.'</span>';
}