If you don't mind an extra database query, it's probably simplest just to do it inside your advanced theme function. Something like:
global $qa_login_userid, $qa_db;
if (isset($qa_login_userid)) {
$userpoints=qa_db_single_select($qa_db, qa_db_user_points_selectspec($qa_login_userid));
if ($userpoints['points']<200)
// DO YOUR THING
}