The proposed solution of letting you buy a PvE flag with $$$ would solve your problem. Adding a PvE flag under this idea would be buying a premium convenience feature. Much like how donation gives you the convenience of not waiting in queue on busy days, this extra donation would give you the convenience of not having to deal with no-skill hacks camping out the lowbie watering holes. As with any donation, it saves you wasted time. But this has the added importance of preventing people from getting harrassed to the point of rage-quitting the server, and the huge potential of bringing in thousands of new players - 100% of which are donators. The end result, the percentage of players here who are donators goes WAY up, more money for server, bugs faster fixed, and it allows those who want a true PvE flag to put their money where their mouths are (so to speak).
The idea opens up a whole new and previously un-discovered revenue stream. And it doesn't throw off balance of the game nor turn it in to a fun-server to do so.

