Here's an interesting quote from the head of the Korean stock exchange from a few days ago :-
"“We will develop new indices, such as those covering high-dividend stocks or preferred shares, to widen the base for dividend-related investment,” he said without further elaboration.
http://www.koreaherald.com/view.php?ud=20140720000191
If the Korean authorities are successful in persuading listed companies to boost their dividend payouts this should make preferred shares more attractive relative to common shares. And if the KRX wants to highlight valuations of preferred shares that doesn't sound like a bad thing for those invested in them either.