Classic
Servers in this list should attract new players, thus they need to be entertaining and work properly. If servers can't seem to get enough players or their content is inapropriate, fails to meet a certain standart ect.. than these servers simply don't deserve to be on this list. These servers aren't paid for so they should bring in atleast some money for Graal online.
Most of the classic servers don't have owners resposible for their content, simply managers appointed by previous managers or other staff. The PWA could take a supervising role these servers.
Classic servers could have a quota set for the monthly/weekly development releases that they need to preform to keep their content updated and expand it (like most proffesional online games). The PW Team could simply have a small role in this such as checking that quota's are met and content is appropriate. *
The PW Team could also make sure that each server has certain bonus's for VIP/Gold accounts compared to expired gold & trial accounts.
Hosted
The Idea Houdiniman has is pretty good.. no comments on that
* The PW Team could make sure that Classic servers have a very profesional winter/christmas packadge (bug free) done in august already ect. (They don't need to play baby sitters but they could advise servers to think ahead)